Hello all, I have a sporterized mauser, there are no markings on it with the exception of a few that I will post pics.of, the ring measures 1.3 inches exactly, the mounting holes are 7 and 5/8 inches apart it has an aftermarket barrel chambered in 300 savage, it seems as tho someone sanded the markings off except the ser.no, not sure what else to say except thanks to all.