I have a good many of the older drop forge wrenches, and sometimes they have numbers. Also my set of JH Williams wrenches, 1920s versions are numbered, bigger the wrench higher the number. That bend in the wrench looks like it was heated, bent to 90 degrees. Then later was heated again and brought back to straight. The crease tells me the modifier used a technique known as blacksmith corner, sharper than just bending. The deep Vee, and the other odd shape on the opposite end makes me think this was supplied with a pump or early engine.