Hi Rich, I haven't see John's drawings, and I have no idea what the mark on Neil's front sight base signifies. The mark on FNorm's base that you posted earlier, is a Police inspection mark, the mark I showed, on the blade itself, is an Erfurt inspection mark (on an early DWM gun), that signifies that it is a retrofitted 5.5mm blade. There were other changes that occurred over time in the number of serrations on the blades themselves, but that's another story! Regards, Norm
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