I am also not the expert that G.T. or Joop is, but have seen a number of original unmolested numbered military magazines that show the signs of finish grinding like G.T. described above. It has caused me to not automatically reject magazines that show some finish grinding as manipulated.
These came as un-matched magazines with a number of Lugers I've bought, so there would not have been any reason to manipulate them. This magazine came with a 1936 dated S/42 Mauser military accepted Luger that was in very high condition, so it is not period correct either.
I don't know the history of the magazine I started the post off with, which is why I asked the question, especially after seeing an unnumbered one sell at Legacy Collectibles recently.
I'm trying to visualize the "bowtie" that G.T. mentioned. Is this it:
Is it likely that the mold bubbles defect would have caused Haenel to sell this as a commercial police magazine instead of trying to get it military accepted?
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.