I'll ask him if there are numbers along with the "K" he already mentioned under the toggle. He was hoping that there were other collectors with Lugers marked this way. Gibson mentions some "reworks"were marked with an incircled HK, or just HK on the breech. So maybe not one of a kind, just very rare.
I forgot to mention that there is a horizontal C/N stamp on the right side of the center toggle (first photo). It's much smaller than the C/N stamp on the left receiver. He is going to bring it to the next local gunshow (Aug. 15-16). I'll bring my camera and get some nice closeups.
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Mike C.
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