Viggo, I no longer have any of the big Luger reference books, but
as I recall, I believe that the reason the thread was British Whitworth is because the finest machinery available at the time was ONLY available in English measurements and that the original Luger manufacturing equipment was in fact English or even American made. It wasn't just for the screw threads. I envision that all the metric dimensions were hand converted from the metric system in the manufacturing process. Perhaps one of the members with a good reference library can verify this...
regards,
John Sabato
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