Omega Speedmasters do not have case numbers stamped into them like Rolex serial numbers. Instead they have individual Omega serial numbers stamped into the watch movement. This does mean you need to remove the caseback to be able to see the movement and to find out the Omega movement number. From this, however, you can begin to estimate the date of your Omega.

The only real way of being able to ascertain exactly when an Omega was issued is by contacting Omega directly through their website. They can issue you with an Extract from the Omega Archives for a small charge. This will give you specific information from the archives on how the watch left their production facility and the exact date of your Omega. This extract is simply that – it is not an Omega Certificate of Authenticity.

However for a good estimate of the year of your Omega watch you can date it by checking your movement number against this Omega Movement Number Database.

Omega Movement NumberYear
14m1957
14m1958
16m1959
17m1960
18m1961
19m1962
20m1963
22m1964
22m1965
23m1966
24m1967
26m1968
27m1969
28m1970
30m1971
31m1972
32m1973
32m1974
33m1975
34m1976
35m1977
37m1978
38m1979
40m1980
42m1981
43m1982
44m1983
45m1984
46m1985
47m1986