Erl,
The left "proof" is actually and inspector's stamp, certifying that the receiver has been hardened. It is the first stamp applied to the receiver. The date was stamped at the same time as this stamp.
The right stamp, a "heraldic eagle", is actually the firing proof, certifying that the gun has successfully passed firing two overpressure rounds. It is part of a set of three proof stamps, the second is visible on the barrel in this photograph and the third is found on the left side of the breechblock.
Of the two stamps which are missing, the stamp in the second position would certify inspection after the pistol's assembly, and the last stamp would certify acceptance after the pistol's shooting-in (it would have been stamped -after- the firing proof).
1918 was the last year that Lugers were manufactured for the Imperial Army. By the example of your pistol, Army inspectors were cutting corners to certify these guns for use--it is noteworthy that the two stamps which -did- make it onto this gun certify actual safety-oriented inspections.
It would be useful to know this Luger's serial number and letter suffix. to see if itis possible to determine how close this gun is to the ehd of production.
--Dwight
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