“U.S. INT. REVENUE DEPARTMENT”. 4″ high x 2 1/2″ wide. Brass body. Brass shackle. A paper seal padlock. “U.S. INT. REVENUE 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.