This is an older porroprism that fits the rear axial port of a Questar to give upright images when the scope is used as a spotter. It includes the necessary swivel coupling. It has been just cleaned and checked by Questar and works perfectly. However, there is a slight chip visible at the housing edge of one prism which does not effect performance in any way, but that you should know about. New price for all this would be $510. Will sell shipped CONUS for $175. Paypal OK.
Would trade for a good eyepiece.