Check the barrel and receiver.
Will be hard to find, and expensive. Do an internet search for Corson's Barrels.
Browning.com has sn data under customer service. I couldn't find the sweet sixteen
You will have to call Browning with the sn to find out.
Blue Book of Gun Values
You will have to call Browning to find out.
A replacement barrel for a J. Stevens Arms C20-A shotgun can be found at a local gun/firearms store. If the replacement barrel is not available on site, ask if the store can order it for you.
The barrel will be marked as to where it was made. Browning.com has sn data under cusotmer service. How it compares is a subjective call that only you can make after handling other makes.
Try gun shops, gun shows, pawn shops, on line auctions, want ad, for sale ad, estate sale, garage sale.
Well, If you are in Britain, you can find them: Bletchley Town, Milton Keynes in La Chateau
Go to Browning.com and look under customer service.
You will have to call Browning with the sn to find out