I've been meaning to post this, but with all the craziness lately I haven't had a chance. I posted a very recent acquisition of an 8" Meade that I was trying to identify, and back in November 2018 a 10" f/7.1 Cave Astrola from 1959 that I restored. This RV-6 was from Facebook Marketplace as well, and nearly as soon as it posted an astronomy buddy messaged me as it was only about ten minutes away. I contacted the owner, who moved recently from Colorado and was selling it for $75. It was hard to tell from the photos as it was generally just the tube and pieces of the mount. I went, curious as to what kind of scope it was, and as soon as I looked at it the maker was plain to see. Criterion advertised themselves everywhere on this scope. A quick glance at the mirror gave me hope it would clean, and then I saw the accompanying box that she had, which had letter, eyepieces, and even the original paperwork. It was clear that this was someone's complete setup and I bought it without hesitation.
I got it home and looked up Criterion, as I did not know much about them, much like when I got the Cave. There is little to no rust anywhere, and the mirrors cleaned up beautifully for 55-year-old coatings! I will clean up all the metal and bring it back to life. The optics already showed how good this old scope performs. It's nicely portable considering I'm comparing it to the Cave. This will be a fun, little scope to enjoy in the coming years.
On a side note, there was another RV-6 in our area that I purchased. It was a much newer version and completely trashed. However, it did have to very nice vinyl end caps and a 32mm Criterion eyepiece. I snapped it up for $15 and have a spare parts from the OTA (no mount with that purchase). The tube will go in the trash it is so bad, but I only got it so I could use the caps on the first RV-6 purchase.
Edited by Guy Earle, 25 March 2020 - 07:56 PM.