I saw a picture of one just like mine in a local National Parks Services Library's book, IDed as european. They wouldn't allow me photocopying the page, arguing potential copyright infringement issues. I explained to them it didn't apply for this case, but apparently they don't know the applying laws, and don't care to learn them either...
I have seen several spanish blunderbusses of identical design, but in iron. In fact, the stock design is identical to my flintlock fusil Modelo 1792. That's the reason I suspect it's either Belgian or French. Although the four chambered shield atop the barrel is very similar to that of Spain, with a Crown sitting on top...
