Ed:

The design appears similar to that of the Bernardelli, Beretta and a number of other Italian hammerguns I've seen. I have a dim recollection that V. Bernardelli might have been the source for the actions on nearly all of these, although the individual shop may have finished them or simply had the maker put the Seller's name on the gun. I recently saw a nearly identical gun with a German maker's name and address, but Italian proofmarks. It was at a gun show and the dealer was asking in the $850 range. It was still on his table on Sunday afternoon.

Rem