Hi Juergen,
The first 'proof eagle' dates from the time the gun was manufactured, 1918. The second (rightmost) 'proof eagle' was in use as a Wehrmacht acceptance proof from 1936 - 1939.
A change in proof marks in 1950 is logical since the post-1939 one was a Nazi-swastika one and therefore not fit for use after WW2. I guess they just returned to the 1936 - 1939 proof since that one was 'a-political' and available.
Therefore I think this particular gun was reproofed between 1936 - 1939.
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