2 3/4″ wide. (actual: 2.756″ wide x 3.448″ high x 0.734″ deep). Brass body. Brass shackle. Post key. Spring dust guard. “W.BOHANNAN. BROOKLYN.N.Y.” is stamped on the dust guard. “PATENTED 8 APR 17 1860” is stamped on the obverse of the shackle. Catalog #: 8, first appears in catalog of 1869.Patent # 27883.