Cosmetically the item looks in very good condition, as shown on the pictures. 

Optics condition: needs cleaning! There is quite a bit of dirt inside the optics, maybe condensation, mushrooms. The front glass appears to be scratched, probably as a result of improper cleaning. (There is a possibility of impact on photography.)

The slotted rail moves smoothly and clicks securely into place at the selected slot.

The item pictured is the actual item for sale.