MCNJ, I have NEVER seen such a proof on the rear of the frame, that is the point. This luger is unusual in that respect. The test proofs are usually on the right side of the receiver and on the barrel near the receiver. It is things like this that make the luger hobby such an interesting endeavor. Costanzo's World of Lugers, on page 330 does not show this proof on the frame rear as well.
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