...no markings other than a small MFD USA on each wrench of the set....
Not to be picayune (there is a madness to my method...), but verbatim, it's actually "
MFD. U.S.A.". The periods are really hard to see on the tinier tools (midget handles, etc), but they're there. Why I make the clarification is because it's exactly like the Plomb Empire marking circa 1946 forward. Which has always seemed a little strange to me.
Other than Plomb Empire (Plomb, P&C, Proto, PENENS/Fleet) and Thorsen (including Giller and Dayton) tools, can anyone think of anyone else who used "
MFD." as an abbreviation for "manufactured"? Off the top of my head, I can't.
It seems odd to think this way, but it's either a bizarre coincidence, or there is a connection. A connection does not seem to be completely out of the question given the fact that Ned Boyd was affiliated with P&C in the early days. But, that ended in 1929, P&C wasn't bought by Plomb until 1941, and Ned Boyd was no longer affiliated with Thorsen in 1946, when the Plomb Empire started using "
MFD.".
Did P&C use it early? When did Thorsen start using it?
I know, I know, a lot of idle ruminating over a little abbreviation. But again, it's not actually that common. It's so uncommon, in fact, that it's thought of as a later (post-1946) Plomb Empire 'tell' - if not for Thorsen and Thorsen-made Giller and Dayton also using it. It just nags at me. Probably is just a bizarre coincidence.