Hi All,
Just found this site a few days ago and been educating myself in the archives, but here is a thread I can help with!
I think the date on Joe's Cashmore is a bit earlier than suggested above. I inherited a sidelock Cashmore from my grandfather, number 20003, and he died in a car wreck in 1939, hit by a drunk driver while enroute to his duck camp on Cape Cod.
My father used it only a little and the gun was well worn when I started hunting with it in the late '70s, checkering quite worn and the barrels silvered at the hand grip area. Bore is still excellent and action tight.
I have the hunting log from my grandfather's duck camp and there is a reference to his using a new gun, but I don't remember the date, believe early '30s.
If I have a chance this evening, I will try to find the reference in the log and a photo, but fear this may be beyond my capabilities on the computer,