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Enter the movement serial number and get the approximate production year, with the full movement-serial tables, a dedicated Speedmaster breakdown, and an honest note on why modern Omegas cannot be dated this way.
Type the digits engraved on the movement — usually seven or eight, e.g. 24123456 or 17654321. Leave out dots and spaces.
The serial dates the watch. It does not tell you which model you have — that is the reference number, formatted with dots. If you don't have it, upload a photo and the identifier returns the reference in seconds.
Unlike Rolex, Omega dates watches by movement serial, not case serial. It is engraved on the mainplate or the bridge, so the caseback has to come off to read it. Numbering runs in a single sequence from about one million in 1894 upward, so a higher number means a later movement.
From roughly the 1990s Omega added an eight-digit serial to the outside of the case. It identifies the watch but carries no public date mapping. The dotted number — 145.022, or a modern 310.30.42.50.01.001 — is the reference, which identifies the model, the case, and the dial variant, not the individual watch.
For the Co-Axial and Master Chronometer generation there is no published serial-to-year mapping and no reliable chronological pattern. Any site claiming to date a modern Omega from its serial alone is guessing. Use the warranty card, the dated receipt, or an Extract from the Archives.
| Approximate years | Serial range | Confidence | Notes |
|---|---|---|---|
| 1894 – 1902 | 1,000,000 – 1,999,999 | Low confidence | Earliest numbered movements. |
| 1902 – 1908 | 2,000,000 – 2,999,999 | Low confidence | — |
| 1908 – 1912 | 3,000,000 – 3,999,999 | Low confidence | — |
| 1912 – 1916 | 4,000,000 – 4,999,999 | Low confidence | — |
| 1916 – 1923 | 5,000,000 – 5,999,999 | Low confidence | Wide block: WWI-era output records are patchy. |
| 1923 – 1929 | 6,000,000 – 6,999,999 | Low confidence | — |
| 1929 – 1935 | 7,000,000 – 7,999,999 | Low confidence | — |
| 1935 – 1939 | 8,000,000 – 8,999,999 | Approximate | — |
| 1939 – 1944 | 9,000,000 – 9,999,999 | Approximate | — |
| 1944 – 1947 | 10,000,000 – 10,999,999 | Approximate | — |
| 1947 – 1950 | 11,000,000 – 11,999,999 | Approximate | — |
| 1950 – 1952 | 12,000,000 – 12,999,999 | Approximate | — |
| 1952 – 1954 | 13,000,000 – 13,999,999 | Good confidence | — |
| 1954 – 1956 | 14,000,000 – 14,999,999 | Good confidence | — |
| 1956 – 1958 | 15,000,000 – 15,999,999 | Good confidence | — |
| 1958 – 1960 | 16,000,000 – 16,999,999 | Good confidence | — |
| 1960 – 1962 | 17,000,000 – 17,999,999 | Good confidence | — |
| 1962 – 1963 | 18,000,000 – 18,999,999 | Good confidence | — |
| 1963 – 1964 | 19,000,000 – 19,999,999 | Good confidence | — |
| 1964 – 1966 | 20,000,000 – 21,999,999 | Good confidence | — |
| 1966 – 1967 | 22,000,000 – 23,999,999 | Good confidence | — |
| 1967 – 1968 | 24,000,000 – 24,999,999 | Good confidence | — |
| 1968 | 25,000,000 – 25,999,999 | Good confidence | Caliber 321 gives way to 861 around 26 million. |
| 1968 – 1969 | 26,000,000 – 27,999,999 | Good confidence | — |
| 1970 – 1971 | 28,000,000 – 28,999,999 | Good confidence | — |
| 1971 – 1972 | 29,000,000 – 32,999,999 | Approximate | Large block: numbering jumps in this period. |
| 1972 – 1973 | 33,000,000 – 34,999,999 | Approximate | — |
| 1973 – 1974 | 35,000,000 – 36,999,999 | Approximate | — |
| 1974 – 1976 | 37,000,000 – 38,999,999 | Approximate | — |
| 1976 – 1977 | 39,000,000 – 39,999,999 | Approximate | — |
| 1977 – 1980 | 40,000,000 – 43,999,999 | Approximate | — |
| 1980 – 1985 | 44,000,000 – 45,999,999 | Low confidence | Quartz-crisis output; documentation thins out here. |
| 1985 – 1990 | 46,000,000 – 48,999,999 | Low confidence | — |
Omega has never published these ranges. They are compiled from archive extracts and dated examples, so treat every row as an estimate — the 1950s to early 1970s blocks are the tightest, pre-1935 and post-1980 the loosest. Movements were also frequently cased and sold a year or two after being numbered.
The Speedmaster is the one Omega where a serial can be pinned tightly, because the caliber changeover and the case-reference sequence cross-check the number. Caliber 321 runs to roughly serial 26 million; caliber 861 takes over from there in 1968.
| Approximate years | Movement serial | Caliber | Case reference |
|---|---|---|---|
| 1957 – 1959 | 15,000,000 – 16,999,999 | 321 | CK2915 |
| 1959 – 1962 | 17,000,000 – 18,499,999 | 321 | CK2998 |
| 1962 – 1963 | 18,500,000 – 19,999,999 | 321 | 105.002 / 105.003 |
| 1964 – 1966 | 20,000,000 – 23,999,999 | 321 | 105.012 / 145.012 |
| 1966 – 1968 | 24,000,000 – 25,999,999 | 321 | 145.012 |
| 1968 – 1971 | 26,000,000 – 28,999,999 | 861 | 145.022 |
| 1971 – 1976 | 29,000,000 – 38,999,999 | 861 | 145.022 / 145.0022 |
| 1977 – 1985 | 39,000,000 – 45,999,999 | 861 | 145.0022 / ST 145.0022 |
Reference and serial have to agree. A 145.022 case with a caliber 321 movement, or a CK2998 with a serial in the 30-million range, means the watch has been put together from parts — common on the vintage market and a significant hit to value. Later Speedmaster Professionals (1990s onward) are dated from the caseback serial and paperwork rather than these ranges.
A serial can disprove authenticity but never establish it. If the number dates to before the reference existed, if it contradicts the caliber inside the case, or if it is shallowly etched rather than crisply engraved, you are looking at a counterfeit or a re-cased watch. The reverse never holds: a plausible serial is exactly what a good fake carries, because it was copied from a genuine watch.
For an authoritative answer, Omega sells an Extract from the Archives, which returns the caliber, reference, production date, and original delivery destination for a specific movement serial. It is ordered through Omega directly and is the document serious vintage buyers ask for. Our 11-point authenticity checklist covers the physical tells, and the serial number location guide shows where every major brand hides its number.
Before buying, run the serial against The Watch Register and Chrono24's stolen-watch database. Both are free to search and both cover serials reported stolen.
On vintage and mid-century Omegas it is engraved on the movement itself, so the caseback has to come off — this is the number that dates the watch. From roughly the 1990s onward Omega also engraves an eight-digit serial on the outside of the case, usually on the caseback edge or between the lugs at 6 o'clock. The number formatted with dots, such as 145.022 or 310.30.42.50.01.001, is the reference number and identifies the model, not the individual watch.
You can estimate the production year from the published movement-serial tables, which is what the lookup on this page does. You cannot verify authenticity or ownership that way, because Omega does not run a public serial database. Omega does sell an Extract from the Archives, which returns the caliber, reference, production date, and original delivery destination for your specific serial — that is the only authoritative answer.
They are approximations reverse-engineered from thousands of archive extracts. The 1950s through early 1970s blocks are reasonably tight; pre-1935 and post-1980 blocks are much looser because far fewer documented examples exist. There is also a structural lag: a movement numbered in one year was often cased and sold in the next, so the retail date can be later than the table suggests.
Speedmaster movements came from the same numbering pool, but the model gives two extra cross-checks nothing else does: the caliber changeover from 321 to 861 around serial 26 million in 1968, and a well-documented sequence of case references (CK2915, CK2998, 105.012, 145.012, 145.022). Together those pin a Speedmaster far tighter than the general table can, and they expose swapped movements when the caliber, reference, and serial block disagree.
It can flag a fake but never confirm a genuine watch. A serial that dates to before the reference existed, a movement serial that contradicts the caliber, or an acid-etched instead of crisply engraved number all point to a counterfeit or a re-cased watch. A plausible serial proves nothing on its own, because counterfeit batches are stamped with numbers copied from real watches.
They cannot be dated from the serial. The modern Co-Axial and Master Chronometer generation uses serials with no usable chronological pattern, so the year has to come from the warranty card, the dated purchase receipt, or an Extract from the Archives. If your watch has a card with a scannable code, the date is on the card.
The serial dates your Omega. A photo identifies it: reference number, dial variant, caliber, specs, and current market pricing.
Sequential and letter-prefix tables from 1926 to today, with a live lookup.
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The 11-point authenticity checklist we run on every identification.