Hi, JAM was an importer in the 60's and 70's. The Spanish guns they imported were low end quality. This was the period of the cheap Spanish guns that are infamous to say the least. These guns were the price point specials that have turned off more than a few shotgunners to spanish guns.

Makers such as Gasper Arizaga and a host of smaller makers made these beauties.

It would be hard to tell who made the guns without the makers mark.

Best of luck!

Greg

Gregory J. Westberg
MSG, USA
Ret