Antares Optics 1.3 Inch Minor Axis Secondary Mirror. New, only unwraped to check out a couple of months ago. I decided not to do the project I originally bought it for. 1/20 Wave PV (.055) with Zygo GPI interferometer documentation. Pyrex (I think.) Current price on website is $70 plus shipping. I'm selling for $50 firm, including shipping CONUS. Prefer payment by Money Order. Sorry, I don't do PayPal. Please note my Astromart rating. Thanks for looking.