That's interesting. Registered to Vanadium-Alloys Steel Company in Latrobe, PA. And I might've thought someone made the wrench from a bar of it, and decided to record for posterity what he used, but the wrench looks much older than 1950 to me.
Thanks. It could be both dynamo related
and RR related. Railways used dynamos to create electricity for all kinds of things, including power, lighting, and even friction-less brakes.
I am not saying I have definitively identified the purpose of your wrench. I am just saying that the terminology reminds me of terms often used in old textbooks to describe dynamos, which use poles and a magnet to convert the magnetism into electrical current running through the poles to the armature, limbs, etc, optimizing the current (and minimizing the eventual dissolution of the iron) with fixtures that keep the poles and the lines of induction spread apart at certain lengths.
Further readings about old dynamos with insightful descriptions using this terminology linked
here,
here, and
here.
EDIT: On second thought about
@ararat 's TM find..., if I hand-forged a DOE wrench from a bar of RED STAR TOOL STEEL, right now, in 2025, and stamped it myself, by hand, with letter figure punches, it would probably look crude and antique, too. The question is does the flip side marking make sense? If it's a reference to a dynamo, were they still using and servicing dynamos in the 1950s? It's possible.