Don,
at first I thought that it would be a Police unit mark but with the information from H.R.v. Stein AND Jans list :
1913 Erfurt, sn 321a, marked G.K.29.
1913 Erfurt, sn 403a, marked G.K.47.
1914 Erfurt, sn 2515 marked G.K.74.
1914 Erfurt, sn 2446, marked G.K.122.
with the numbers so close together it think that it could really be a Imperial unit mark.
The numbers are too close together .....
Best regards
Klaus
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