I feel like we've had this conversation before. FDR was using all the powers of the executive branch that he could muster beginning as early as late 1939 to do as much as possible short of declaring war. In 1940, the Navy was conducting operations in the North Atlantic to keep shipping lanes open, the Treasury Dept was ordering tools from mfgrs to ship to the Allies under the Lend-Lease program, and the Army and Army Air Forces were already letting contracts unprecedented in number and size for planes, ships, tanks, and other equipment, including tools. The War Production Board's publication,
Major War Supply Contracts, published in late 1945, starts in June 1940, when they were an office within the Office of Emergency Management, and ends in September 1945. That's how the US Government defined wartime, and frankly, I don't know what else you would call such a build-up for war. Plomb was the earliest, under contract ("Misc. Tools" to an unspecified Army agency) in June 1940, Crescent ("Pliers," QMC), Fairmount ("Tools," QMC), Kennedy ("Toolboxes", USAAF) and Union Steel Chest Corp ("Toolboxes," Ordnance Dept) under contract in October 1940, Utica ("Pliers", Signal Corps) under contract in November 1940, and Snap-on the subject of the thread, under contract with the USAAF for "Tools" in December 1940. Bonney, Armstrong, Duro, and too many to list were under contract in the first couple months of 1941, well before Pearl Harbor.
That's not an argument for the wrenches without a date code being 1940. But they could be.
I can't be the only one who is seeing Stromberg part numbers every time I look at these numbers. They all started with a T- and they all had five digits. These are
a little low for the Stromberg series I am used to seeing in USAAF and B.A.C. manuals (e.g., T-18xxx, T-19xxx, etc) and I'm
not saying they're wrenches for Stromberg aircraft engine parts, but the similarity in nomenclature is really hard to ignore. And using process of elimination, they definitely aren't Wright, PWA, Ranger, Merlin/Packard, Continental, Hamilton, or any other I am familiar with, either.
As for geometry and bends, the Air Corps had all kinds of crazy drive tool wrenches. These flare/line crowfoot wrenches are
not on these pages. Posted just for effect...