This eyepiece is from Gary Russell, who sells them new for $45 plus shipping as 15mm, 65 degree superwide Konigs (1.25" barrel). My measurements are
Focal Length (from exit pupil measurement) 17.9mm
Field Stop Diameter (direct measurement) 20.8mm
Apparent Field of View (direct measurement) 68 degrees
A great eyepiece for the price.
Asking $35 shipped to destinations in North America (and Hawaii). PayPal OK. (SOLD)