The complete reference — full production tables from 1894 to today, the dedicated Speedmaster serial chart, all four reference number eras explained, a position-by-position PIC14 decoder, and step-by-step authentication.
Omega watches use two completely separate identification numbers that are easy to confuse. The serial number is a 7- to 9-digit number engraved on the movement (or, on modern watches, the case) and is used for production dating. The reference number (also called a PIC, or Product Identification Code) describes the model itself — what collection, materials, size, movement, and dial. Standard Omega serials ran sequentially from 1,000,000 in 1894 through roughly 99,999,999 in 2019, after which Omega switched to randomized non-sequential serials. The Speedmaster collection has its own dedicated serial sequence beginning in 1957 — using the standard chart for a Speedmaster will give you the wrong year.
- Where to Find an Omega Serial Number
- Serial Number vs. Reference Number
- Standard Serial Number Chart (1894–2019)
- Speedmaster Serial Number Chart (1957–2000)
- Post-2019 Randomized Serials
- The Four Reference Number Eras
- MAPICS System (1962–2007)
- PIC8 System (1988–2007)
- PIC14 Decoder (2007–Present)
- PIC14 Collection Codes
- PIC14 Material & Movement Codes
- Authentication: Genuine vs. Fake
- Extract from the Archives & Official Services
Where to Find an Omega Serial Number
Unlike Rolex (rehaut and lugs) or Breitling (caseback at 6 o’clock), Omega has placed serial numbers in four different locations over its 130-year production history — and the location depends on the era and model. This is a recurring source of confusion, especially for first-time vintage Omega buyers.
The number printed on the warranty card or the reference engraved inside the caseback is not the serial number. The serial is always purely numeric (no letters, no periods) and is between 7 and 9 digits long. If you are looking at something with letters, dots, or fewer than 7 digits, you are looking at the reference number — keep searching for the serial.
Serial Number vs. Reference Number: What’s the Difference?
Every Omega carries both numbers, and they answer two completely different questions:
- The serial number answers when the watch was made. It is unique to that individual movement, runs sequentially across nearly all of Omega’s production from 1894 onward, and is the primary tool for production dating.
- The reference number (or PIC) answers what the watch is. It identifies the model family, case material, diameter, movement type, dial, and bracelet — but tells you nothing about when this specific example was assembled.
To fully document an Omega, you need both. The serial gives you the year; the reference gives you the configuration. Together, they let you check whether the watch you are holding matches a real, known Omega specification — which is the foundation of any meaningful authentication check.
Standard Omega Serial Number Chart (1894–2019)
Use this table for every Omega collection except the Speedmaster — Seamaster, Constellation, De Ville, Aqua Terra, Planet Ocean, Geneve, Ladymatic, and all pocket watches and dress models. Speedmasters have a separate sequence (next section). Find the range that contains your serial, and read across for the approximate production year.
| Serial Number Range | Approx. Production Year |
|---|---|
| Early Mechanical & Pocket Watches (1894–1939) — first sequential numbering | |
| 1,000,000 – 1,999,999 | 1894 |
| 2,000,000 – 2,999,999 | 1902 |
| 3,000,000 – 3,999,999 | 1906 |
| 4,000,000 – 4,999,999 | 1910 |
| 5,000,000 – 5,999,999 | 1915 |
| 6,000,000 – 6,999,999 | 1923 |
| 7,000,000 – 7,999,999 | 1930 |
| 8,000,000 – 8,999,999 | 1934 |
| 9,000,000 – 9,999,999 | 1939 |
| Post-War Wristwatch Era (1944–1969) — golden age of Constellation, Seamaster, De Ville | |
| 10,000,000 – 10,999,999 | 1944 |
| 11,000,000 – 11,999,999 | 1947 |
| 12,000,000 – 12,999,999 | 1950 |
| 13,000,000 – 13,999,999 | 1952 |
| 14,000,000 – 14,999,999 | 1954 |
| 15,000,000 – 15,999,999 | 1956 |
| 16,000,000 – 16,999,999 | 1958 |
| 17,000,000 – 17,999,999 | 1959 |
| 18,000,000 – 18,999,999 | 1961 |
| 19,000,000 – 19,999,999 | 1962 |
| 20,000,000 – 20,999,999 | 1963 |
| 21,000,000 – 21,999,999 | 1964 |
| 22,000,000 – 22,999,999 | 1965 |
| 23,000,000 – 24,999,999 | 1966 |
| 25,000,000 – 25,999,999 | 1967 |
| 26,000,000 – 27,999,999 | 1968 |
| 28,000,000 – 31,999,999 | 1969 |
| Quartz Crisis & Transition (1970–1989) — gaps appear; ETA-based calibers introduced | |
| 32,000,000 – 32,999,999 | 1970 |
| 33,000,000 – 33,999,999 | 1971 |
| 34,000,000 – 35,999,999 | 1972 |
| 36,000,000 – 37,999,999 | 1973 |
| 38,000,000 – 38,999,999 | 1974 |
| 39,000,000 – 39,999,999 | 1975 |
| 40,000,000 – 40,999,999 | 1977 |
| 41,000,000 – 41,999,999 | 1978 |
| 42,000,000 – 43,999,999 | 1979 |
| 44,000,000 – 44,999,999 | 1980 |
| 45,000,000 – 45,999,999 | 1982 |
| 46,000,000 – 47,999,999 | 1984 |
| 48,000,000 – 48,999,999 | 1985 |
| 49,000,000 – 50,999,999 | 1986 |
| 51,000,000 – 51,999,999 | 1989 |
| 52,000,000 range | Never used — skipped entirely |
| 53,000,000 – 53,999,999 | 1991 |
| Modern Mechanical Revival (1993–2008) — Co-Axial era, Seamaster Diver 300M, Aqua Terra | |
| 54,000,000 – 54,999,999 | 1993 |
| 55,000,000 – 55,999,999 | 1995 |
| 56,000,000 – 59,999,999 | 1998 |
| 60,000,000 – 60,999,999 | 1999 |
| 61,000,000 – 64,999,999 | 2000 |
| 65,000,000 – 65,999,999 | 2001 |
| 66,000,000 – 67,999,999 | 2002 |
| 68,000,000 – 69,999,999 | 2003 |
| 70,000,000 – 71,999,999 | 2004 |
| 72,000,000 – 77,999,999 | 2005 |
| 78,000,000 – 80,999,999 | 2006 |
| 81,000,000 – 83,999,999 | 2007 |
| 84,000,000 – 90,000,000+ | 2008+ |
| Reliability decreases sharply after 2008. Around 2019, Omega exhausted the sequential 8-digit range and switched to randomized non-sequential serials. | |
For most production years from 1920 through the early 2000s, this chart dates a watch to within roughly one to two years. Some inherent imprecision exists because Omega serial numbers were typically assigned to movements at the time of manufacture, but movements could sit in inventory for months or years before being cased and sold — so the production year of the movement does not always match the year the finished watch left the factory. The 52,000,000 range was skipped entirely, and gaps in the sequence reflect the chaos of the quartz crisis and the brand’s transition to ETA-based calibers.
Omega Speedmaster Serial Number Chart (1957–2000)
This is the chart most people get wrong. The Speedmaster — Omega’s most famous collection and the first watch worn on the moon — has used its own dedicated serial number sequence since 1957, completely separate from the rest of Omega’s production. Looking up a Speedmaster serial on the standard chart above will give you the wrong year, sometimes by several years.
The data below reflects the consensus of Roman Hartmann’s authoritative Omega Speedmaster Evolution research, widely regarded as the definitive collector reference for Pre-Moon and Moonwatch dating. The chart also includes the reference numbers in production each year and the calibre transitions.
| Year | Serial Range | Reference Numbers | Calibre |
|---|---|---|---|
| 1957 | 14,xxx,xxx | CK 2915 | 321 |
| 1958 | 15,xxx,xxx – 16,xxx,xxx | CK 2915 | 321 |
| 1959 | 16,xxx,xxx | CK 2998 | 321 |
| 1960 | 17,xxx,xxx | CK 2998 | 321 |
| 1961 | 18,xxx,xxx | CK 2998 | 321 |
| 1962 | 18,xxx,xxx – 19,xxx,xxx | CK 2998, ST 105.002 | 321 |
| 1963 | 20,xxx,xxx – 21,xxx,xxx | ST 105.003, ST 105.012 | 321 |
| 1964 | 22,xxx,xxx | ST 105.003, ST 105.012 | 321 |
| 1965 | 22,xxx,xxx | ST 105.003, ST 105.012 | 321 |
| 1966 | 23,xxx,xxx | ST 105.003, ST 105.012, ST 145.003, ST 145.012 | 321 |
| 1967 | 24,xxx,xxx – 25,xxx,xxx | ST 145.012 | 321 |
| 1968: Calibre 321 phased out, replaced by 861 — a watershed moment for the Speedmaster Professional | |||
| 1968 | 26,xxx,xxx | ST 145.012, ST 145.022 | 321 / 861 |
| 1969 | 26,xxx,xxx – 27,xxx,xxx | ST 145.022 | 861 |
| 1970 | 28,xxx,xxx – 30,xxx,xxx | ST 145.022, ST 145.0022 | 861 |
| 1971 | 30,xxx,xxx | ST 145.0022 | 861 |
| 1972 | 31,xxx,xxx | ST 145.0022 | 861 |
| 1973 | 31,xxx,xxx – 32,xxx,xxx | ST 145.0022 | 861 |
| 1974 | 32,xxx,xxx | ST 145.0022 | 861 |
| 1975 | 33,xxx,xxx | ST 145.0022 | 861 |
| 1976 | 34,xxx,xxx | ST 145.0022 | 861 |
| 1977 | 35,xxx,xxx – 36,xxx,xxx | ST 145.0022 | 861 |
| 1978 | 37,xxx,xxx | ST 145.0022 | 861 |
| 1979 | 38,xxx,xxx – 39,xxx,xxx | ST 145.0022 | 861 |
| 1980 | 40,xxx,xxx – 41,xxx,xxx | ST 145.0022 | 861 |
| 1981 | 42,xxx,xxx | ST 145.0022 | 861 |
| 1982 | 43,xxx,xxx | ST 145.0022 | 861 |
| 1983 | 44,xxx,xxx | ST 145.0022 | 861 |
| 1984 | 45,xxx,xxx | ST 145.0022 | 861 |
| 1985 | 46,xxx,xxx | ST 145.0022 | 861 |
| 1986 | 470,xxx,xx | ST 145.0022 | 861 |
| 1987 | 4725,xxxx | ST 145.0022 | 861 |
| 1988 | 4750,xxxx | ST 145.0022 | 861 |
| 1989 | 4775,xxxx | ST 145.0022 | 861 |
| 1990 | 4800,xxxx | ST 145.0022 | 861 |
| 1991 | 4825,xxxx | ST 145.0022 | 861 |
| 1992 | 4827,xxxx | ST 145.0022 | 861 |
| 1993 | 4829,xxxx | ST 145.0022 | 861 |
| 1994 | 4830,xxxx | ST 145.0022 | 861 |
| 1995 | 4831,xxxx | ST 145.0022 | 861 |
| 1996 | 4832,xxxx | ST 145.0022 | 861 |
| 1997: Calibre 861 phased out, replaced by 1861 — the modern Moonwatch caliber still in production today | |||
| 1997 | 4834,xxxx | ST 145.0022 | 861 / 1861 |
| 1998 | 4835,xxxx | ST 145.0022 | 1861 |
| 1999 | 4840,xxxx – 7700,0xxx | ST 145.0022, 3570.50 | 1861 |
| 2000 | 7701,0xxx onward | 3570.50 | 1861 |
This chart is most reliable for standard production Moonwatches with calibers 321, 861, and 1861. Limited editions, Snoopy commemoratives, Mark series watches, Speedmaster Reduced models, and watches powered by calibers 863 or 1863 do not always fit this table cleanly. For watches outside the standard production line, cross-reference with the ilovemyspeedmaster.com database, which compiles confirmed Extracts from the Archives. After approximately 2000, Speedmaster serials rejoin the standard Omega numbering system in the 7-digit and 8-digit ranges.
The Post-2019 Randomized Serials
Around 2019, Omega exhausted the available range under its long-running sequential 8-digit numbering system (it had reached the 99,999,999 ceiling) and made a fundamental change: modern Omega serial numbers are no longer sequential. They are randomized 8-digit numbers, similar in design to the way Rolex moved to randomized serials in 2010.
What this means in practice:
- You cannot determine the production year of a post-2019 Omega from the serial number alone using any chart, including this one.
- Production dating for modern Omegas requires either the warranty card date, the original purchase receipt, or a request to Omega directly.
- The serial still serves its core authentication purpose — every legitimate Omega has a unique number on file with the brand — but its dating function is gone for current production.
- Reference numbers (PIC14) remain fully decodable for modern watches, so the model, materials, size, movement, and dial are all still readable from the engraving.
If you are evaluating a watch with a serial above approximately 99,000,000, or one that does not fit any logical range in the standard chart, you are almost certainly looking at a post-2019 piece — and the warranty card or receipt is your best dating tool.
The Four Reference Number Eras
This is where Omega becomes genuinely complicated — and where almost every other guide oversimplifies. Unlike Rolex (which has used essentially one continuous reference number scheme for 70 years) or Breitling (two systems with a clean break in 1979), Omega has used four different reference number formats, and for nearly twenty years two of them ran in parallel. Knowing which system applies to your watch is the first step in decoding it.
When the PIC system was introduced in 1988, MAPICS was already deeply embedded in Omega’s internal manufacturing, spare parts catalogs, and service documentation. Many calibers and case designs had been in production for decades under MAPICS, and rewriting service manuals for every model would have been a massive undertaking. So Omega kept both: MAPICS continued for production and service operations, while PIC8 served the retail-facing world of warranty cards, hangtags, and dealer materials. A 1995 Speedmaster Professional, for example, could legitimately be referred to as either ST 145.0022 (MAPICS) or 3570.50 (PIC8) — both are correct, and you may see either or both engraved on the watch and printed in the documentation.
The MAPICS System (1962 – 2007)
MAPICS references appear in two main formats:
- 6-digit format: XY.123.456 — common in the 1960s. Example: ST 168.005 (a Constellation “Pie Pan”).
- 7-digit format: XY.123.4567 — phased in from the 1970s onward. Example: ST 145.0022 (a Speedmaster Professional).
The two-letter prefix encodes case material:
| Prefix | Material | Notes |
|---|---|---|
| ST | Stainless steel | By far the most common prefix on production Omegas |
| BB | 18k pink/rose gold | Less common; appears on dress and Constellation models |
| BA | 18k yellow gold | Solid gold dress watches and high-end Seamaster/Constellation |
| DD | Gold-filled / gold-capped | Vintage dress models, particularly 1950s–60s |
| MD | Two-tone (steel + gold) | Used on certain mixed-metal Constellations and Seamasters |
The three middle digits (e.g., the “145” in ST 145.022) typically describe the watch type and complication family — for example, 145 covers manual-wind chronographs, while 168 covers automatic chronometers. The trailing 3 or 4 digits identify the specific case design within that category. Omega never published an official decoding key for the middle digits, but extensive collector research has reconstructed most of the logic.
The PIC8 “Short PIC” System (1988 – 2007)
The PIC8 short reference is an 8-digit code typically presented in three groups: XXXX.XX.XX. A real example: 3570.50.00 (Speedmaster Professional Moonwatch on bracelet).
Each group of digits carries meaning:
- First digit (family): Identifies the broad product family. Generally: 1 = Constellation, 2 = Seamaster, 3 = Speedmaster, 4 = De Ville, 5 = Special / Limited Editions.
- Digits 2–4: Sub-family and case design.
- Digits 5–6 (after the first dot): Case material and bracelet type combination.
- Digits 7–8 (after the second dot): Dial color and sometimes regional market variation.
PIC8 references continue to appear on warranty cards, vintage service receipts, and in Omega’s spare-parts documentation. If you have an Omega from the 1990s or early 2000s, you may see a PIC8 number on the warranty card and a MAPICS number stamped inside the caseback — both refer to the same watch.
The PIC14 Decoder (2007 – Present)
The current 14-digit PIC reference is the most informative reference number any Swiss watch brand has ever used. Once you know how to read it, the entire configuration of the watch — collection, case material, bracelet, diameter, movement type, complications, dial, and production sequence — is encoded in those 14 digits.
The format is always: AAA.BB.CC.DD.EE.FFF
Example: Speedmaster Professional Moonwatch on Bracelet
A second example — the Seamaster Diver 300M reference 212.32.41.20.04.001:
- 212 = Seamaster Diver collection
- 32 = Steel case with non-metal strap (rubber)
- 41 = 41mm diameter
- 20 = Co-Axial automatic, no additional complication
- 04 = Specific dial color/finish
- 001 = First sequence within this configuration
PIC14 Collection Codes (Position AAA)
The first three digits identify the model family. References starting with 1 are generally Constellation, those starting with 2 are Seamaster, those starting with 3 are Speedmaster, those starting with 4 are De Ville and Ladymatic, and those starting with 5 are Special Releases and Olympic limited editions. Common collection codes:
| Code | Collection | Notes |
|---|---|---|
| 123 | Constellation | The signature dress collection with claws and Manhattan design |
| 212 | Seamaster Diver 300M | The post-James Bond era dive watch line |
| 215 | Seamaster Planet Ocean | Used for many Planet Ocean references |
| 220 | Seamaster Diver 300M (current) | Newest generation Diver 300M, post-2018 redesign |
| 231 | Seamaster Aqua Terra | Versatile sport/dress hybrid line |
| 232 | Seamaster Planet Ocean | Alternate Planet Ocean code |
| 233 | Seamaster 300 | The vintage-inspired Master Co-Axial line |
| 234 | Seamaster Diver 300M (newer) | Recent Diver 300M variants |
| 311 | Speedmaster Professional | The classic Moonwatch family — 42mm manual-wind |
| 327 | Speedmaster Mark II | Reissue of the 1969 cushion-case design |
| 329 | Speedmaster Racing | Co-Axial chronograph line |
| 331 | Speedmaster ’57 | The 1957 Broad Arrow-inspired line |
| 425 | Ladymatic | Women’s automatic dress line |
| 431 | De Ville Hour Vision | The transparent-side-window De Ville |
| 432 | De Ville Trésor | Ultra-thin manual-wind dress watch |
| 522 | Olympic Special Editions | Limited editions tied to Olympic partnership |
PIC14 Material & Movement Codes
Position BB — Case Material & Bracelet/Strap Type
The BB digits are a matrix code. Roughly: 10–13 are stainless steel on various strap types, 30–33 are steel with a non-metal strap or non-metal accent, 50–53 are solid gold, 90–93 are “other material” (typically ceramic, titanium, or composite).
| Code | Case & Bracelet/Strap |
|---|---|
| 10 | Steel case, steel bracelet (paved) |
| 13 | Steel case, non-metal strap (leather, rubber, NATO) |
| 20–23 | Two-tone — steel and gold |
| 30–33 | Steel case with “other material” — typically a ceramic bezel insert |
| 50–53 | Solid gold case (yellow, rose, or white) on bracelet or strap |
| 60–63 | Gold and other material combination |
| 90–93 | Other material case — full ceramic, titanium, or composite |
Position DD — Movement Type & Complications
The first D identifies the movement family; the second D counts complications beyond hours, minutes, seconds, and date.
| First D | Movement Type |
|---|---|
| 0 | Manual-wind mechanical |
| 1 | Quartz |
| 2 | Automatic mechanical |
| 3 | Mechanical chronograph (manual) |
| 5 | Co-Axial mechanical chronograph |
| 8 | Master Chronometer (METAS-certified) |
The second digit of the DD pair counts complications. For a standard time-and-date Co-Axial automatic, you would expect “20” — Co-Axial automatic with no additional complications. For a chronograph with a date, it would be “30” or “51” depending on whether it is a standard or Co-Axial chronograph and how Omega counts the chronograph itself toward the complication total.
Authentication: Genuine vs. Fake
Omega is among the most counterfeited Swiss watch brands, and Speedmasters and Seamaster Diver 300Ms are particular targets. Serial and reference numbers are the first authentication checkpoint, but they are not sufficient on their own — sophisticated fakes now reproduce legitimate numbers cleanly. Use them as a starting point.
- Serial number falls within a logical range and the calculated production year is consistent with the model’s known release window
- For Speedmasters: the serial range, reference number, and caliber all align with the same year on the dedicated Speedmaster chart
- Engraving is sharp and crisp — laser-etched numbers on modern Omegas should be uniformly deep with clean edges; movement engravings on vintage watches should be precisely cut, not stamped
- The reference number on the watch matches the warranty card and any service paperwork exactly, including punctuation
- Movement caliber number, when visible, matches the calibers Omega is known to have used in that reference for that year
- For modern PIC14: collection code (AAA), material code (BB), and diameter (CC) all match the actual watch when measured and inspected
- Dial printing is precise — the Omega Ω logo and “OMEGA” wordmark show clean serifs under magnification, no blurring or uneven ink
- Serial number falls in a range that contradicts the model’s release year (a Seamaster Aqua Terra with a serial mapping to 1985 is impossible — the line did not exist)
- Speedmaster serial dated using the standard chart — always verify with the dedicated Speedmaster table; a 1969 Moonwatch should have a serial in the 26–27 million range, not the 28–32 million range the standard chart would suggest
- Engraving that looks shallow, uneven, or “etched on top” rather than cut into the metal
- Inconsistent fonts between the engraved serial and the rest of the case markings — Omega uses specific typography that fakes often miss
- Reference number with extra or missing digits, wrong punctuation, or letters where there should be numbers
- Caliber visible through display caseback that does not match documented Omega specifications for that reference
- Complete absence of a serial number anywhere on the watch — except for some specific quartz-era ETA-based models, every genuine Omega has a serial
- Serial number that appears in multiple online listings — fakes frequently recycle a small set of valid serials
A serial number alone cannot authenticate an Omega. High-quality counterfeits replicate numbers, reference engravings, and even movement markings convincingly. Real authentication requires physical examination of the movement, case finishing, dial printing, hands, crown, and bracelet, compared against documented specifications for the specific reference. When the value at stake exceeds a few thousand dollars — particularly for vintage Speedmasters, military-issued Seamasters, and rare Constellations — a hands-on inspection by a trained Omega specialist or a request to Omega’s Heritage Department is the only authoritative answer.
Extract from the Archives & Official Services
Omega has historically offered two distinct services for verifying production details and authenticity. The current status of each is worth knowing before you start a request:
Extract from the Archives
The Extract is a paper document — historically priced around CHF 120 / USD $150 — that confirms the production date, original delivery destination, caliber, case metal, dial, and bracelet for a given serial number based on Omega’s internal production records. The service was temporarily suspended in 2023 following a high-profile fraud case involving Omega’s own Heritage Department, in which a senior employee was alleged to have facilitated a manipulated Speedmaster sold at auction. As of 2026, Omega is working on an enhanced version of the service. Check the official Customer Service portal for current availability before assuming you can order one.
Certificate of Authenticity
Distinct from the Extract, the Certificate of Authenticity involves shipping the watch to Omega’s facilities in Switzerland for a physical examination by their watchmakers. The watch is opened, inspected against archival production records, and confirmed (or not) as authentic in its current configuration. The service is generally available for watches over 30 years old, costs more, and takes longer than an Extract — but it is the most authoritative verdict possible short of a forensic analysis. The Certificate accounts for the watch’s current state and components, while the Extract only documents how it left the factory originally.
Other Verification Channels
- Omega Boutiques and Authorized Service Centers can typically run a serial number against Omega’s internal records during a service intake, and may also accept Extract requests on your behalf.
- Omega US Customer Service: US residents have historically had to request Extracts via Omega US (1-800-766-6342, or OmegaUSCS@swatchgroup.com) rather than through the website form.
- Specialist collector databases like ilovemyspeedmaster.com (for Speedmasters) and the Omega Forums archive often have more granular reference-level coverage than Omega’s official records, particularly for transitional and limited-edition pieces.
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Get a Free Omega Appraisal →Quick Reference: Which Table or System to Use
| Your Watch | How to Date It | What to Decode |
|---|---|---|
| Speedmaster (any era through 2000) | Use the dedicated Speedmaster Serial Chart. Do not use the standard chart. | Reference (CK, ST, or PIC8/PIC14 depending on year) + caliber number on movement |
| Standard Omega 1894–2008 | Use the Standard Serial Number Chart. Accurate to within 1–2 years. | MAPICS reference inside caseback + PIC8 on warranty card |
| Modern Omega 2007–2019 | Use Standard Chart for serials below ~99M; cross-check with PIC14 collection. | 14-digit PIC14 reference (AAA.BB.CC.DD.EE.FFF) |
| Post-2019 Omega | Serial dating not possible — randomized numbers. Use warranty card date or contact Omega. | 14-digit PIC14 reference still fully decodable |
| Vintage Pocket Watch (pre-1894) | Pre-dates the modern serial system. Requires Heritage Department research. | Caliber and case markings; contact Omega Heritage |
Le Watch Buyers · Watch Education & Blog Series · lewatchbuyers.com · Serial number tables reflect collector-documented production data and Roman Hartmann’s Omega Speedmaster Evolution research. Standard charts are accurate to within 1–2 years for production from approximately 1920 through 2008. Speedmaster serials follow a separate sequence and require the dedicated chart. Post-2019 serials are randomized and cannot be used for dating. Reference number decoders reflect published collector consensus; Omega does not officially publish complete position-by-position documentation. For insurance, legal, or significant-purchase verification, an Extract from the Archives or Certificate of Authenticity from Omega’s Heritage Department is the only authoritative source.