Tom --



Beautiful watch



I suspect you know this, but if it is a 1947 movement, it doesn't have a calibre number. Omega first used calibre numbers in 1949.



When they did, calibre 260 was the base movement for the subsecond version: 30 T2 p15. The same movement just prior to the use of calibre numbers would be engraved "30 T2"m under the balance wheel.



In any case, what a beautiful survivor . . .





Sam