2″ wide. (actual: 1.930″ wide x 2.521″ high x .508″ deep). Brass body. Brass shackle. Post key. No spring dust guard. “W BOHANNAN NY” is stamped on the obverse of the body. “PATENTED APR 17 1860” is stamped on the obverse of the shackle. The reverse of the lock is blank. Catalog #: 4, first appears in catalog of 1869.Patent # 27883.