Simson is one of those companies that's frequently misspelled. (Kinda like Bernardelli.) It was indeed seized by the Nazis, after which it became BSW. Resurrected by the Commies after the war, when Germany split. So some guns marked Simson will be pre-war and made by an independent, Jewish-owned company. Others will be post-war, and made in East Germany. The German date code, among other factors, will tell which are which.