Titles says all... I just recently bought a Vintage Seamaster Cosmic 2000 online and want to buy a new strap before it arrives, but I am not sure what size it is. Can anybody help me out?
It's a bit like saying I bought a Ford Fiesta on line and what new tires for it what size are they. This reference came in many bracelet styles.
If it's the same as the model below, it's 20mm. I recently had this serviced by Omega and had them put on an OEM strap and deployant:
I think we can assume OP doesn't have the integrated bracelet version. My money's on the model I posted above or something similar to this one: In either case, 20mm is what's needed...
You can assume all you like. I'm not going to make any proclamations until I know the reference #. If the OP wants info, it would help to provide more than what's on the dial.