John Venarsky,
Remo is the brand name for Rempt Brothers in Suhl (Gebrueder Rempt, REMO Gewehrfabrik). If any manufacturing records survived, they may be located in the Museum there. For general information, you might try the German Hunting Guns website. Actually, the Germans didn't stop making hunting guns until the very end of the war. I even saw a drilling that was proofed in Mar. 1945.
Mike