2 1/4″ wide. (actual: 2.282″ wide x 2.958″ high x .573″ deep). Bronze body. Bronze shackle. Post key. No spring on dust guard. Catalog #: 78, first appears in catalog of 1880. “W.BOHANNAN BROOKLYN, N.Y. PAT. JUNE 25.79 78” is stamped on the obverse of the shackle.Patent # 205171.