VERY RARE 

Sonar Jupiter 8 50mm f/2 Lens Professionally Calibrated For Leica Standard CLA 

As you can see in the photos - it's in Very Good Condition.

Body has some wear. Front optical element has some wear from cleaning, rear is clean. 

Iris blades are clean of oil. The diaphragm moves nicely at every aperture position. 

The diaphragm-control ring turns smoothly and accurate. 

The focusing turns smoothly and precise.

GOD BLESS YOU!!!