Well, this is the last piece from the 6" f15 Cheshire Brass Refractor. I believe this to be about 20 years old, but it looks almost new. I believe the original owner never used it. The mirror has been cleaned and does have a sleek when viewed at the right angle. I am sure this will not affect the views. Comes with machined 1.25" adapter, brass thumb screw, and cap.