Jerry, maybe I did not explain clearly. I had proof #50 on 2 lugers. On the first luger proof #50 had the letters PS next to it. On the second luger proof # 50 had the letters RBL nex to it. My opinion is that the PS stood for postschutz (postal) and the RBL stood for Reichsslufscutzbund (state air protection league)
The explanation in the book states that proofs # 49,50, 51 indicate a contract production weapon.
I don't know how this relates to the supposed navy luger other than that proof marks were similar. Just my opinion,Jerry you may now unload your weapon and put the safety on. Your friend Chuck
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