Is it possible these holsters were made during WW2 ??
Well, I suppose anything is possible.
However, I base my opinion on when this model of holster came into use on my observations of contemporary photos over many years. I am not aware of a single photo of this holster in use during WW2, and I've spent a lot of time searching for and collecting photos of USGI holsters. The very few pics that I have seen of this holster in use have all been KW era. My view on this would change if reliable evidence, such as contemporary photos, were found.
Scott Meadows in his US Military Holsters book shows two examples, one an incomplete Navy marked example which he simply says is "unidentified". The second example is essentially identical but is marked Enger-Kress on the reverse with no Navy marking. The caption indicates that the latter example is part of the USMC Museum collection and it bears a Marine Captain's name inked on the back side. I have never observed another example of this holster made by Enger-Kress, a Wisconsin company well known for making US holsters during both WW2 and the Korean War. Meadows went on to say that he had not found any drawings or documentation pertaining to this holster.
I can't explain the differences in rank of aviator Caffey, other than to speculate that perhaps the LCMDR rank may have been wartime rank, and that he reverted to the LT rank during peacetime.
I have several of these holsters in my collection. Here is one that is slightly different from your example. It, too, was made by the Assembly & Repair Dept. at Norfolk NAS. However, it bears a USN within an oval impressed into the front side. The ammunition slide is seen mounted on the chest strap. Here are a couple of pics I took today.
Edited by Charlie Flick, 25 February 2017 - 05:50 PM.
Reinserted pics from dead link