“U.S.N.”. 2 1/8″ high x 1 1/8″ wide. Brass body. Steel shackle. No Clevis. Keyway: Paracentric. “GN7956” is stamped on the base of the body. “MFRD. BY INDEPENDENT LOCK CO. FITCHBURG.MASS.U.S.A. LUBRICATE WITH GRAPHITE” is stamped on the reverse of the body.