15.5mm Russell Superwide in mint condition. 2" barrel, soft fold-down rubber eyecup, about 13mm of eye relief, and 65 degree apparent field. Focuses a mm or two farther in than a 40mm Pentax XL. Bought new for testing last week. This eyepiece has great-looking multicoatings and performs very well in both my 6" f/6.7 and 10" f/5 Newts, just some astigmatism as you approach the edge though much better than the 16mm UO Konig, if memory serves, and the eye relief is a lot more comfortable than the UO's. Centrally it is very, very sharp. Probably should keep it, but I'm trying to scrape up the dough for something else.
$57 shipped in US. PayPal and US Postal Money Orders accepted.