Looks like the Wilton vise was born out of WWII

I suspect that the other vise makers, with more mature casting, forging, and machining capabilities focused on the war effort; just like Chrysler making tanks, Ford making bombers, Singer – guns etc.

Wilton’s first and only customer from 1941-1945 was the U.S. Government, and we all know how the Government loves the lowest bidder. :)