U/D Control knob for GI scopes compatible with 145-190, 260 and 290 series (pre-owned)

Pre-owned U/D knob compatible with Olympus 145-190, 260 and 290 serie scopes. Knob is tested and fully function.  The part is build from 1 piece which make the star shaped o-ring irrelevant.

Click here for L/R knob