What has me hooked though is the brass tag from the United States defense plant corporation during World War II.
Was part of the Fisher aircraft division who made a very fast climbing fighter called the P-75 "eagle" but it was ultimately shelved for the P-51 mustang and the P-38 Lightning.
Nice vise and tag, Hoorn! "Ultimately shelved" is the most polite way to characterize the XP/P-75 project. It is the Rodney Dangerfield of WWII fighters.

But, just as a friendly FYI, your vise may just as well have been used on any number of projects. GM's Fisher Body (Aircraft) Division built parts for the B-17, B-25, B-29, P-80, and other aircraft. The XP/P-75 was their scheme to have a signature fighter of their own, but it was actually a very small part of their total production.
As you probably know, the DPC bought machines, vises, and hand tools - even entire buildings, or funded the construction of new facilities, to augment defense production. Your vise could've been provided to any one of the GM Fisher plants involved in aircraft parts production, and also and probably very likely Cleveland, Ohio, which they added at the onset of the war specifically to increase defense production.
I passed up a Reed 203R (too expensive) with a DPC GM Linden plant tag (where the airframe of the F4F Wildcat was built) a few years ago, linked
here.
At the risk of thread drift (DPC tags DO show up on lots of vises though!), but to put all this in context, in terms of magnitude, for you or anyone else who may be interested, see the attached excerpt I made.
GM received over $1B from the federal government during WWII. Their Fisher Division alone received $124M. Those figures are not the amount of the contracts awarded to them to build things, and those figures don't include the contract numbers. That's just equipment, buildings, machinery, tools, etc to augment and upgrade the capacity of their existing plants and production capabilities.
I will point out a few things and orient the chart. See Civilian Production Administration at the top? That is what the War Production Board changed their name to in 1946 after the war. In 1946 they began publishing statistics. This is just one of many references. Column 1 is what the recipients were manufacturing in 1939. Column 2 is what they were manufacturing for the government in the buildup to and during WWII. Column 3 is how much they got to upgrade their facilities. Column 4 is how much of that came from the government. Column 5 is which government agency. WAR is War Dept. AC is Air Corps. DPC is DPC. The DPC spent a little over $50M on GM Fisher. Some of that was your vise.
GM entries take up six (6) of the 549 pages of this reference. I only excerpted their total line, and then the Fisher section.
GM was #2 on the list of companies that got the most money to upgrade their facilities.
Anybody want to guess who was #1?