“U.S. STEAMBOAT DEPARTMENT”. 3 1/4″ high x 2 1/2″ wide x 1″ deep. Bronze body. Bronze shackle. A paper seal padlock. The reverse of the case is blank. “U.S. STEAMBOAT DEPARTMENT” is stamped on the obverse of the body. “PATENTED SEP.28.1852 OCT.16.1860 APR.18.1865” is stamped on the obverse of the shackle. “THOMSON’S PATENT OCT.18.1864 199 WATER ST. NY” is stamped on the seal.Patent #’s 21636 RE1063 US Patent #47352. More… More…