Giorgio,
Thank for the additional photos.
Well, it certainly looks like you have a well used and honest example of a late 1937 Model P.08 made by Mauser.
It is typical of late 1937 production: Blued small parts, hump on the frame, Inspector SE63.
For your information, empirically derived data indicates approximately 90 percent of the pistols produced in the "no suffix" block of 10,000 pieces looked exactly like yours.
Enjoy your pistol.
John
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