I have a Kasai 6mm Ortho eyepiece for sale (see picture below. The 9mm is already sold).
Kasai is the OEM for UO Orthos and are well know for their quality.
This eyepiece is in MINT condition.
No set screw mark or scratch. Optics is as clean as new.
I will ship with original box and a homemade eyecup. The eyecup can put your eye at the right position to see the entire FOV but avoid hitting the lens.
Ask for $40. Price include shipping to most part of the world (including CONUS).
Paypal preferred (no extra fees).