Your model 59 with the J. Stevens Chicopee Falls address on the barrel narrows down it's manufacture date some.
After Savage bought J. Stevens they continued the J. Stevens until the late
40's and then dropped the J. and called it just Stevens. They moved out of Chicopee about 1960.
The model 59 was manufactured from the 30's thru the 70's.
So, my guess on the manufacture of your shotgun to be 30's or 40's.
I'm with you on the $200 price, that's more than I would expect to get for one, but you never know. The online auctions have about 20 of them from $50to $250 and they don't have bidders at either end. I think if I were retailing a decent one I would mark it $125 or so.
Here's the parts breakdown: