Phillipe,
I can add a little more information from my own research following my purchase of a deactivated 1906/29 Swiss Luger a few years ago.
The mark on the rear of the receiver is the 'Waffenfabrik' Bern marking.
The ‘M under cross’ is the proof of proof of Maj. Mühlemann, who was the factory inspector between 1913 and 1941.
I read that if a soldier elected to keep his firearm upon his retirement, before the weapon was released by the Swiss Military they were refurbished by the factory and stamped “P”, which on my example is stamped on the right-hand side of the frame.
The frame well of the 1906/29 were also stamped with the date of manufacture, month and year (two digits: MM.YY) on military and private sale pistols up to 1943.
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