I'm selling two Celestron ortho eyepieces: an older 4mm and a newer 9mm, both for $70 shipped in the US by Priority Mail, payable by PayPal only, please.
I'd say that the 9mm is probably the newer one because of the more modern-looking Celestron name on it and the box. The 4mm is in good shape; the 9mm is in very good shape. Both were made in Japan and have the circle/V marks on the barrels.
Thanks for looking!