Wanted for personal research purposes, information on any Mauser Sporting rifle or carbine in the serial number range of 70,000 to 85,000 with a caliber marking of the two numerals 6,5 on the side of the barrel. The caliber of interest has the two numbers ONLY and not any other letters or numbers referring to case length. Attached is a picture for reference. Please contact me if you have any marked like this. Also, does anyone know the significance of the P. P. mark?