Antique Keystone “Leader” coin silver. 900 fine open-face pocket watch case, size 18s, with hinged front bezel. 58mm across and weighs 123g total. Style: Open face with hinged bezel. Maker: Keystone Watch Case Co. Condition: Hinges and work smoothly, covers close securely, nice antique patina. Perfect for fitting an 18s movement from Waltham, Elgin, or other American makers, or for collecting as a complete case. Please review all photos for condition.