“U. S. INT REV”. 3 7/8″ high x 2 1/2″ wide. Brass body. Brass shackle. A paper seal padlock. “T. SLAIGHT PATENT U. S. INT REV” is stamped on the obverse of the body. “20641” is stamped on the obverse of the shackle. “SLAYMAKER LANC, PA.” is stamped on the reverse of the shackle.