You may have fallen into the old trap of " if it's old , it must be gold". Unfortunately that's not really true 99and 9/10's of the time. There was no Massachusetts Arms Co., that's just a trade names used by Stevens and H D Folsom on firearms made for a Kansas hardware chain. You gave no information on your shotgun at all, single barrel? double barrel? outside hammers? condition?, thus value is evasive. A trade name double barrel shotgun in excellent condition, maybe 200 to 250. a single barrel in excellent condition maybe 80 to 100. 150 years old? don't think so, 70 to 80 years is more realistic. I just reread you post and it seems you have a single barrel shotgun. Value is as posted above, there are very little collectors interest in these old single barrels, there only value is as a "shooting gun". You can buy a new single barrel at WalMart for 100 dollars.
