If it was a commericial, then it would NOT be dated by the military, and accepted into the military.
Further, the "germany" marking was required by the USA as an export marking, and Germany was at war with the USA in 1918. Yes you could argue that it was already in 7.65mm and then was sent to the USA after WW1 in that caliber.
That said, what year was Datig written?
The information in your book is about 50 years old.
I have not seen any newer information that states that a 'dated' military accepted luger in WW1 was ever in 7.65mm.
Ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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