I have a pre-war Walther SportModell .22 long rifle that I'd like to scope. The receiver and rear third of the barrel are dovetailed and the rifle currently has a rear sight that slides on the dovetail. I'd like to find scope rings with clamp on bases to fit the dovetail, which seems to measure 0.457 inches, using my micrometer.

Can anyone suggest a source for such rings and bases?

Thank you.