There has been much talk about these on the us fighting knife sites.
I do believe the originals should have some markings on the underside of the grip.
I have personally seen a lot that did not, and they are deemed repos.
There are usually a few listed on GB and Ebay.
These would have came from my era of Army service, but I'm sooo far behind on the WWII, this will have to wait.
Congrats
Ed