This is a 10mm Type 1 Lanthanum eyepiece with fully multi-coated optical Lanthanum Crown glass. It, as you can see, has very little marrings on the barrel. The lenses and their coatings are in excellent shape (it has six or eight lenses--I can't remember). I have the original box and caps. $40.00 plus shipping. The buyer pays total + shipping via Paypal. Thanks for looking and clear skies!