Steel body. Brass shackle. Keyway: Flat. “SARGENT” is embossed on the obverse of the shackle. “NEW HAVEN, CT., U.S.A.” is embossed on the reverse of the shackle. “PAT’D JUNE 18TH 1912” is stamped on the base of the body.Patent # 1029942. (PK-LS-057P-S1-F).