2 1/2″ wide. (actual: 2.384″ wide x 3.692″ high x .632″ deep). Bronze body. Bronze shackle. Post key. No spring on dust guard. Catalog #: 82, first appears in catalog of 1922. “W.BOHANNAN BROOKLYN, N.Y. PATD JUNE 25 78 82” is stamped on the obverse of the shackle.Patent # 205171.