I was very very lucky to find the trench watch in that condition. Yes, it came off the 'bay and for 1/5th of my max bid - so I felt like I won the lottery on that. Needs a click spring, but otherwise is functional. Post 1950s ones are no problem to find.
I am also guilty of rounding dates - the Searock is really about 1985, I'll edit that.
I have been trying to find at least one representative sample from each decade. Must be in-house and representative of the decade (i.e. 1949 doesn't really satisfy 1940 or 1950).