Here's a speculation, due to my research on a somewhat similar gun I have. As was noted before, it was probably a "Trade Gun", made for the seller and marked with the seller's name. Chances are good that it was made by one of the smaller concerns in Zella-Mehlis. It'll be pretty tough to figure out which one. Anyone have a list of the Zella-Mehlis makers?

Regards
Ken

I prefer wood to plastic, leather to nylon, waxed cotton to Gore-Tex, and split bamboo to graphite.