Roadsterdom:
You may want to post that beauty on the 'Wilton Dating' thread. Bluebolt (and a few others) have a good handle on early Wilton Bullets without a date stamp. If you want to read about the history of that early period, go to page 28 in that thread and read through page 31 or so.
Edit: Quickie summary... Wilton was established in late 1941. The design patent (shamelessly appropriating the York that Vogl was selling at the time) was filed in August 1941 and granted in March 1942. In Vogl's testimony to the US Senate (small business council) after the war he says that they went into production "after the prioritization system" was in effect, a reference to the WPB Supply Priotities Allocation Board, established August 28, 1941. So, late 1941. The earliest reference to a Wilton vise, in a January 1942 trade journal, confirms that. So, it's possible.
The Wilton history pages re-states another part of his testimony saying that all production was US Government sales, but that's not true. His definition included vises sold to other OEM's making aircraft and motor vehicle parts in their stateside factories for the US Government. I haven't actually found any record of Wilton selling vises directly to the US Government (US Army Air Corps, Ordnance Dept, QMC, etc), records that include several other vise mfgrs.
Which is why the provenance of your vise - purportedly approriated from a USAAF base during the war - is very intriguing to me. Thanks for posting.