Other members here shoot pinfire guns regularly. Some might notice this thread and advise where to get appropriate shells. There are folks like this man <http://gadcustomcartridges.com/> that sell obsolete ammo and also custom reload it for you.

I wouldn't worry too much about unknown value. Your gun is probably worth more than you paid for it as a decorator item. You've found a beautiful antique, but there's no value I know of in the maker's name, and few have an interest in shooting pinfire...Geo