The question always arises - what's the manufacturing date on my Omega? Without paperwork there's no way to be sure, but there are tables that you can use (accuracy at BEST is +/- 2 years) that can make a good guess.

For Omega Speedmaster Professional Watches

Year:

Case Reference Numbers:

Calibre:

Serial Numbers:

1957
CK 2915

321

14xxxxxxx

1958
CK 2915

321

15xxxxxxx

16xxxxxxx

1959
CK 2998

321

16xxxxxxx

1960
CK 2998

321

17xxxxxxx

1961
CK 2998

321

18xxxxxxx

1962
CK 2998
ST 105.002

321

18xxxxxxx

19xxxxxxx

1963
ST 105.003
ST 105.012

321

20xxxxxxx

21xxxxxxx

1964
ST 105.003
ST 105.012

321

22xxxxxxx

1965
ST 105.003
ST 105.012

321

22xxxxxxx

1966
ST 105.003
ST 105.012
ST 145.003
ST 145.012
321

23xxxxxxx

1967
ST 145.012

321

24xxxxxxx

25xxxxxxx

1968
ST 145.012
ST 145.022

321
861

26xxxxxxx

1969
ST 145.022

861

26xxxxxxx

27xxxxxxx

1970
ST 145.022
ST 145.0022

861

28xxxxxxx

30xxxxxxx

1971
ST 145.0022

861

30xxxxxxx

1972
ST 145.0022

861

31xxxxxxx

1973
ST 145.0022

861

31xxxxxxx

32xxxxxxx

1974
ST 145.0022

861

32xxxxxxx

1975
ST 145.0022

861

33xxxxxxx

1976
ST 145.0022

861

34xxxxxxx

1977
ST 145.0022

861

35xxxxxxx

36xxxxxxx

1978
ST 145.0022

861

37xxxxxxx

1979
ST 145.0022

861

38xxxxxxx

39xxxxxxx

1980
ST 145.0022

861

40xxxxxxx

41xxxxxxx

1981
ST 145.0022

861

42xxxxxxx

1982
ST 145.0022

861

43xxxxxxx

1983
ST 145.0022

861

44xxxxxxx

1984
ST 145.0022

861

45xxxxxxx

1985
ST 145.0022

861

46xxxxxxx

1986
ST 145.0022

861

470xxxxxx

1987
ST 145.0022

861

4725xxxxx

1988
ST 145.0022

861

4750xxxxx

1989
ST 145.0022

861

4775xxxxx

1990
ST 145.0022

861

4800xxxxx

1991
ST 145.0022

861

4825xxxxx

1992
ST 145.0022

861

4827xxxxx

1993
ST 145.0022

861

4829xxxxx

1994
ST 145.0022

861

4830xxxxx

1995
ST 145.0022

861

4831xxxxx

1996
ST 145.0022

861

4832xxxxx

1997
ST 145.0022

861
1861

4834xxxxx

1998
ST 145.0022

1861

4835xxxxx

1999
ST 145.0022

1861

4840xxxxx

77000XXX

2000
ST 145.0022

1861

77010XXX

Watches with cal. 863 or cal. 1863 and LE don't fit into this table (some of them do, though)

[email protected]uewin.ch

Roman Hartmann

(source: http://www.chronomaddox.com/romans.html)

For all other Omegas
YEARMovement
number
Movement
calibre*
201193 mil.
201090 mil.
200987 mil.
200884 mil.
200781 mil.
200678 mil.
200572 mil.
200470 mil.
200368 mil.
200265.5 mil.
200165 mil.
200061 mil.
199959.8 mil.
199856 mil.
199555 mil.
199354 mil.
199153 mil.
198951 mil.
198650 mil.
198549 mil.
198448 mil.
198245 mil.
198044 mil.
197942 mil.
197841 mil.
197740 mil.
197539 mil.
197438 mil.
197336 mil.1010
197234 mil.
197133 mil.1040
YEARMovement
number
Movement
calibre*
197030 mil.1250
196928 mil.980
196826 mil.
196725 mil.730
196623 mil.711
196522 mil.
196421 mil.700
196320 mil.660, 670
196219 mil.690
196118 mil.590, 592, 593
196017 mil.245, 550, 600
195816 mil.284, 501
195615 mil.267, 455, 470, 480
195414 mil.455
195213 mil.
195012 mil.410, 420
194711 mil.210
194410 mil.100, 260, 280
19439.5 mil.300, 330, 360
19399 mil.220, 240
19358.5 mil.
19307.5 mil.
19257 mil.
19236 mil.
19165 mil.
19124 mil.
19083 mil.
19052.5 mil.
19022 mil.
19001 mil.
18950.50 mil.

(source: http://clockmaker.com.au/rolex_serial_numbers.html)