Nikon Nav 17 / 14 Hyperwide eyepiece
Used only 5 times since new - optically perfect.
Has a few minor scratches on the body (the black bit)
These are slightly better than an Ethos design, though there really isn't much in it.
There is just enough eye relief for me to take in the whole field stop whilst wearing glasses, but that is with my glasses pressed firmly up against the rubber eye guard.
Comes with top and bottom caps and converter lens which makes it operate as a 14mm as well. Two eyepieces for the price of one, basically.
$1500 new if you import them directly from Japan.
Asking $800 + post