The letters are workerstamps. The reason for stamping such letters was that the DWM in this case wont to know who of the workers was working on the part of the gun. If there would have been some more problems with the (Leerenhaltigkeit in German) same parts on several Lugers they could find out, who of the workers made the problems.
I would be able to give more informations about it but because of my poor English I´m missing the right words. But I hope you will know what I mean.
Regards Klaus
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