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30mm Omega calibers

 

Hello

T1 T2 and T3 refers to the variation/type  of the caliber:

30           15J 1939
30T1       15J 1941
30T2       15J 1941
30SCT1  17J 1941
30SCT2  17J 1941
30T2 PC AM (Cal 260)      15J 1943
30T2 PC AM (Cal 261)      15J 1943
30T2 RG (Cal 262)            17J 1943
30T3 PC AM (Cal 265)      15J 1949
30T3 PC AM (Cal 266)      17J 1950
30T2 SC PC AM (Cal280) 17J 1943
30T2 SC RG (Cal 281)      17J 1947
30T3 SC PC AM (Cal283) 17J 1950

where:

AM means anti-magnetic
PC means shock-protected
SC means center seconds
RG means special regulating (chronometer)


BWs
Franco


PS:  the names 26X and 28X where in fact used from 1949, so calibers produced before 1949 have the extended (30T etc ) name printed on the mainplate below the balance wheel,  those after 1949 have 26X or 28X it printed on the front plate.  All furniture Omega I have seen have the post-1949 names.
This message has been edited by Franco on 2011-04-17 11:29:46

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