“U.S. INT REV”. 4″ high x 2 3/4″ wide. Brass body. Brass shackle. A paper seal padlock. “U. S. 1057 INT REV” is stamped on the obverse of the shackle. “AM. SEAL LOCK Co. NEW YORK PATENTED 18 JAN’Y 1870” is stamped on the reverse of the shackle.