Hi, I am new to this knife forum. I recently inheireted a marble's sheath knife that has W.L. Marble Gladstone Mich. on the blade. A friend said this was rare?? I showed it to a guy at a recent gun show and he offered me $300.00 for it.. I almost sold it but decided to keep it. oh yeah it is 9 1/8" total length. blade measures 4 3/4" long. it has black spacers with stag handles and pommel. grips held in place by 4 pins. the scabbard is a long leather tube with a belt loop on the back when knife is placed in tube the only thing showing is the pommel. no markings on scabbard.I actually inheirited a collection of marble's knives. 20 in all. all different. some with m.s.a. ect. was told this W.L. Marble was the oldest and most valuable?? any idea on value. Thanks V.S.