This wrench has the Billings & Spencer logo stamped on one head, and the model number on the opposite. On the shank, the Billings forge mark, Chrome-Molebdenum, and Made In U.S.A. are forged. On the opposing side, one head is stamped with it's U.S.S. size, while the other head is stamped with O.C., U.S.S. and S.A.E sizes.