1) Unmarked Brass diving knife, 12 3/4 inches overall, 6 5/8 inch half serrated blade with brass sheath. 2) U.S. Navy diving knife, 12 3/4 inches overall, 6 7/8 inch half serrated blade marked "PROPERTY OF/U.S. GOVERNMENT" and "U.S.N." marked pommel, with brass sheath. 3) U.S. 1904 Hospital Corp Knife, 17 1/4 inches overall, 11 7/8 inch blade marked "U.S./32145" on the right side and "SA/flaming bomb/1914" on the left, with leather sheath. some light pin pitting in the blade, has signs of sharpening.