Leed, the Swiss contract was for the Luger in its original .30 caliber setup (something that myself and several others think was a good move). The Swiss standard was .30 throughout its service life there even after they started their own production following WW1, though they could be rebarrelled to 9mm. If the Swiss marks on it are legit, that could also be the reason is was in .30 caliber instead.
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-QM
Looking for Mauser S/42 toggle train #22
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