I am the original owner of an Omega Speedmaster 861 Pro that was given to me in the early 70's.
Just had it opened for the first time and I am confused about the date on the case vs. the serial #.
Case # 145022
Serial # 32642971
How can the case be earlier than the movement that all threads indicate to be 1973?
Is this a "transitional watch" that used leftover cases? Is the 71 at the end of the serial # the year of manufacture?