I inherited a german drilling which Im have trouble ID'ing. Im a relative newbie to gun collecting so bear with me please. It is a double barrel 16g shotgun with a 7.7mm rifle barrel underneath. The 7.7mm seems to be an odd choice. It was made in Frankfurt am. The gunsmith was J.Jordan, whom I can find zero info on. I would gues that it is atleast pre-WWII but Im no expert on proofs and stamps. On the underside of the barrels. it has imperial eagles and also crowns with either the letter S, W or U underneath them. There is a Krupp Steal stamps on each barrel. Anyone have any info on this gun? I know its hard to help without a picture. Anyone know of any books on drillings or any where I could go to get more info? Any ideas what a drilling from a small time gunsmith is worth roughly? Thank for any help?