I'm new to this forum but I have just acquired an interesting gun I can't identify and could use some help. The stock has a helmeted man's image and a rosette, the barrels are 38" long, and there's plenty of proof marks but being new to antiques I can't find definitive info online. Photos here: https://www.icloud.com/sharedalbum/#B0k5qXGF1678l4
Any help is greatly appreciated!