As a followup, I just looked at Kenyon. I know he is considered outdated, but there's a lot of information there.
For the 1920 Navy Commercial, as to proofing, he states: "Nitro proof. Some have military proof, or military AND nitro proof, or NONE."
Of course, he notes it will be stamped "Germany" on the front of the frame, or "Made in Germany."
The photo in my edition is grainy, but it looks to me like the example he features in the book has its front sight serrated all the way to the top. It certainly doesn't have a date stamp on the top of the receiver. Also, his example appears to be without proofs. His does have a relieved sear bar.
So my vote is that the GunBroker gun is really a 1920 Navy Commercial.
JMHO, YMMV
Curl
P.S. Kenyon says the 1920 Navy Commercial is scarce.
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