A DOLNE PATENT (APACHE) SIX-SHOT PIN-FIRE KNUCKLE-DUSTER REVOLVER, No. 3944, with blued detachable fluted cylinder also forming the barrels, white-metal frame stamped 'L. Dolne Invur' on one side, folding trigger, sprung folding waved knife-blade mounted on the left, blued external mainspring, and folding white-metal grip pierced for the fingers (iron parts with some surface rust), Birmingham proof marks, late 19th Century