Hi Hoot,

This is a special order zf4x boosted to, perhaps, 8x.
The mount, an original one, seems to me also a special order one, higher than the mounts used with the standard 30mm objetives zf4x and zf6x Jena scopes. That normal mounts differed ONLY in their length: short for the ZKK 601, medium or standard for the ZKK 600, and long for the Magnum lenght action ZKK 602. And so they were marked in the left side. The length of the rail of the scopes was the same one for all.
Anyway, this higher mount works in the same way than the standard ones.

Best!

PH