I own a Tasco 15TE formerly owned by Frederick Ordway. LINK
Ordway knew Kubrick, Clarke, and Von Braun well, he was a technical advisor on 2001: A Space Odyssey.
The Tasco was set up at Ordway's home in Huntsville, where he used to look at the moon, mostly, before a dedicated observatory was set up as part of the lunar landing site selection process. Von Braun, Clarke, and Kubrick probably looked through it.
I have fully restored the OTA and am halfway through the mount restoration though the scope is useable now. I bought it from a picker with some astronomy knowledge, who got it from Ordway's estate sale.
Searching through the Classics forum may find other such celebrity-owned scopes, I've read of several over the years that are now owned by CN members.
I corresponded with Arthur C. Clarke briefly around 1999-2000, he was a true gentleman and sent me a couple of his personal bookplates. They feature dolphins and a monolith- I have set one inside my first edition of A Fall Of Moondust.