Helvetia Men's Watch WWII General Watch Co. Reliable Stores Corp.

Here is a Helvetia screwback watch that I find very intriguing. The movement is hand-engraved with Reliable Stores Inc. I cannot imagine how many of these are out there. Fascinating at the least.
It's very similar to the watches that were issued to the German Luftwaffe. I have seen one with the Reliable Stores Corp. engraved on the movement like this one.