Gang,
Here's a follow up on two wrenches. The first, the auto kit wrench from my post above, which turned out to have some markings under all the rust and crud.
None Better 5/8" x 3/4" Auto Kit Wrench (New Britain Machine Co, est. 1919-1940):This second wrench was not part of the group of stamped wrenches I posted above. In fact, I had tossed this wrench into my scrap bin as a lost cause. But my curiosity got the best of me and I eventually got around to cleaning this wrench up. And, to my surprise found markings on it.
MP Co 11/16" x 13/16" Angle Wrench (OEM unknown, date range unknown):If you know the OEM, approximate date range, or anything else about this wrench, please post. BTW, this wrench is unlike all the other stamped wrenches I posted above; it's 0.250" thick and the angled wrench heads have a slight twist to them, maybe 5 - 10 degrees.