I have a Celestron f/6.3 reducer/corrector for sale that is in very good condition. I don't rate its' condition any higher because it does have some minor cosmetic scratches on the barrel exterior, no box, and one of the two plastic lens caps is cracked. However, the glass is in excellent condition with no signs of prior cleaning or marks of any kind. I will sell for $85 shipped by Priority Mail within the US.
Prefer PayPal and thanks for looking! Regards, Bob