Omega serial number lookup
Type the number engraved on the movement. You get the production year, how much the published tables disagree about it, and which calibre families Omega was building at the time.
Dots, spaces and commas are fine. Vintage Omega movement numbers are 7 or 8 digits. The number inside the caseback is not the serial — see below.
Where the number is — and what isn't the serial
On a vintage Omega the serial number lives on the movement, engraved into a bridge or the main plate. Open the caseback, look at the mechanism, and find a 7- or 8-digit number. That is the one this page reads.
Inside the caseback you will see other numbers. Those are the case reference (two groups like 166.0163, or an older style like 2577-1), the case maker's mark, and on gold cases a fineness stamp such as 750 or 585. None of them is the serial, and none of them dates the watch on its own — though the case reference does tell you what the case was made for, which matters when you are checking that movement and case belong together.
From the 1990s onward Omega moved the serial onto the outside of the watch: on the caseback, or between the lugs at 6 o'clock. On quartz calibres the movement number sits on the electronic module rather than the plate, so a serviced quartz Omega can carry a number that is younger than the watch.
Why the tables disagree
Omega numbered movements in batches, and batches were not always finished and cased in order. That is why every serial lookup on the web says "approximate". What they don't tell you is that they don't agree with each other: the two most-copied tables put the same 1950s number about two years apart, and after 1975 they drift as much as five years apart. A third table that circulates widely is a full decade out in the 1930s–40s. This page runs your number through the two credible ones and shows the full spread, so the answer is honest about how much it knows.
A year band is what a serial can give you. If you need the movement dated tighter than that, it has to be done from the movement itself — the parts Omega changed at known points in production leave physical evidence that a table can't see. That is part of what a Movement ID report does.
What the year tells you: calibre families by era
A serial doesn't name the calibre, but the year narrows the field. The lookup above lists the individual calibres for your year band from Watch Breaker's database of Omega's own GF 620 spare-parts catalogues — 120 calibres dated so far, with sizes and jewel counts — rather than from a generic list. This table is the map of the same territory: the mechanical families Omega was building in each era, by movement size. Dates are introductions and are approximate; families overlapped for years.
| Era | Family | Calibres | What it is |
|---|---|---|---|
| 1939–1963 | 30 mm manual ("30 T2") | 30 T2, 30 T2 SC · 260–269 · 280–286 | The big hand-wound calibre. Sub-seconds (260s) or centre seconds (280s). Renumbered from 30 T2 designations in 1949. |
| 1943–1955 | Bumper automatics ("RA") | 28.10 RA, 30.10 RA · 330–333 · 340–344 · 350–355 | The first Omega automatics. The rotor bumps against springs instead of turning fully; you can feel it. Early Seamaster and Constellation. |
| 1955–1959 | First full-rotor automatics | 470, 471 · 490, 491 · 500–505 | The bumper's replacement. 28 mm, 19,800 A/h. Short-lived — superseded within four years. |
| 1958–1969 | 550 / 560 automatics | 550, 551, 552 · 560–565 · 750–752 | The classic Seamaster, Seamaster De Ville and Constellation calibre. 27.9 mm; 24-jewel versions (551/561/564) went to Constellation. Date versions are the 560s. |
| 1960–1969 | 600 series manual | 600, 601, 602 · 610, 611, 613 | The hand-wound sibling of the 550. Genève, Seamaster, De Ville manual-wind watches of the 1960s. |
| 1969–1980 | 1000 series automatics | 1000–1002 · 1010–1012 · 1020–1022 | Instant date and hacking seconds arrive with the 1000 in 1969. Most 1970s Seamaster, Genève and De Ville automatics. |
| 1942–1968 | 27 mm chronographs | 27 CHRO C12 · 320, 321 | The column-wheel Speedmaster / Seamaster chronograph calibre, Lemania-based. |
| 1968–1990s | 860 series chronographs | 860, 861, 865 · 910, 911 · 920, 930 | Cam-lever replacement for the 321. Speedmaster Professional from 1968. |
| 1954–1975 | Ladies' calibres | 440, 480–485 · 580 · 620, 630 · 640 · 660–663 · 670–685 | Small manuals (440/480/580/620/640) and the 17.5 mm ladies' automatics (660s/670s/680s). |
Family tables put a number in a decade; they don't put it on a calibre. The calibre is on the movement: diameter, height, jewel count, the marking and where it is stamped. One clear photo of the movement usually settles it.
Want the calibre, not just the year? Email a photo of the movement with the number visible to id@watchbreaker.com with the subject "What is it?" — calibre, age band and a value verdict, free, usually within a day. For a written Movement ID report citing the factory catalogue references (US$25), use the subject "Movement ID request". See a sample report.
The serial tables
Both tables used by the lookup, so you can read them directly. Table A gives the first serial seen in each year; Table B is the million-block table that most collector guides reproduce, giving the year each block of a million numbers began. Where they disagree, the lookup shows both and averages them for the headline year.
| Year | First serial (Table A) |
|---|
| Serial block (Table B) | Year |
|---|
Both tables are compiled from collector records, not from Omega. Numbers before about 1930 are sparse and the early rows should be read loosely. From the mid-1970s the two tables drift several years apart — Omega's numbering became irregular in the quartz era — and numbers above roughly 93 million (2015 onward) follow a different scheme and are not dated here.
Questions people ask
Where is the serial number on a vintage Omega watch?
On the movement — a 7- or 8-digit number engraved on a bridge or the main plate. The numbers inside the caseback are the case reference and maker's marks, not the serial. Modern Omegas (1990s on) carry the serial on the caseback or between the lugs.
How accurate is an Omega serial number date?
About two years either way. Movements were numbered in batches and cased out of order, and the published tables disagree with each other by that much in places. Read the spread this page gives you, not just the headline year.
Can I tell the calibre from the serial number?
No. The serial gives a year; the year gives a shortlist of families. The calibre is read off the movement itself. If the calibre number is stamped on the movement you already have it; if not, the size, jewel count and bridge layout identify it.
Does the serial number prove my Omega is genuine?
No. Genuine movements get recased, redialed and repaired with replacement parts all the time, and a plausible number can be engraved on anything. What proves a watch is the way movement, dial and case agree with each other.
Is the number inside the caseback the serial number?
On a vintage Omega, usually not — that is the case reference (for example 166.0163), which identifies the case model. It is useful: it tells you which calibres that case was made for, so a mismatch between case reference and movement is the first sign of a marriage.
My serial is 9 digits or starts with letters — what is it?
Then it is not a vintage movement number. Post-2015 Omega serials use a different scheme, and letters usually mean you are reading a case reference or a service mark. Check the movement.
Watch Breaker is an independent identification specialist and parts dealer and is not affiliated with, endorsed by or connected to Omega SA or the Swatch Group. Omega is a trademark of Omega SA. Serial tables are collector-compiled approximations. Terms.