The Kahles S2 series stacks up pretty well too, I have had a Ziess 4x32 from the same era but mine had ongoing issues. I run several of these on various Mausers, the 4x and 2.3-7 particularly suit the Kurz length actions but would work on the intermediate/standard. Both these scopes share the same tube/ocular/eyepice dimensions so if you are mounting on the ocular bell you rings will fit both.

The Kahles 7a reticule is un-supassed for our NZ style hunting, where shots range from the low light of deep bush to the glare of the open tops. Too my eye the optics of these 1960's scopes is less than 10% behind a current Kahles I have.