The Prussian scabbard had a medal cup in the bottom (inside the leather )with only ball that stuck out the bottom. There was a triangular folded piece of sheet metal (tin?) inside the throat to hold it open. A strap of white leather hung down the front, for securing it to the frog. It also had a wire rod spine to keep the whole thing stiff. My neighbor would remove the bottom ball and the strap, then secure it to a reproduction US type frog and add the bottom brass finial. He made the M'55 type scabbard (like the first one you posted for the 58 cal, which appears to be "63 contract scabbard).