Gerben,
My reading of the subject is that the 'Untersichung' is true for the German proof law of 1891, in force until the proof law of 1937; and which remained in use throughout that time by the proof house in Oberndorf (seen on Mausers). In 1911-1912 the proof houses in Suhl, Zella-Mehlis, and Frankfurt/Oder agreed upon a Nitro proof protocol and the c/N stamp, which was never officially part of the state proof act.
The 1950 East German proof law used both the c/U and c/N, but retained the c/U only in its 'inspected' sense; the actual overcharge power proof was the c/N. The eagle is the 'final proof', in a sense a final acceptance mark.
It is quite correct that finding the c/U on East German Lugers is not the norm, and the proofing suite on this gun is evidence of its being considered as a completely new assembly in its present form.
--Dwight
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