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Found these watch cases on eBay. Cheaper than Oakley's Watch Vault, and they come in bright blue and lime green. Pretty decent quality for the price, and slightly bigger than Oakley's as you can see from the picture. The blue makes it easy for me to find it among my stuff!
This one wasn't on my "priority" list, but it is a welcome distraction while the primary searches continue.😀
Enamel dial, hinged caseback, caliber 13 SO (which I would guess was originally for a small pocket watch or wristlet?)
I have seen Signal Corps-issued watches that appear to be the same reference.