To all - I have been in contact with the seller of the 10" Mak - he is legitimate, he teaches astronomy and physics in Caracas, Venezuela but wishes to emigrate. The telescope belonged to his grandfather and was custom made for him by John Gregory himself - the designer of the Gregory Maksutov, which is the basis of the Questar, the C90, the ETX90, countless telephoto lenses, tracking cameras for NASA - it's one of the great designs in history and this one was made by the man himself. His telescopes are known to be works of art and this one is no different - it is massive, 350mm in diameter - Gregory's Maks typically have a f/3.5-f/3.7 primary and come in at f/14-15 after the secondary magnification. To accomplish that for a 10" scope requires an aspherical primary. This one almost surely has an elliptical primary. The nearest thing to compare this scope to is the legendary 10" Gregory Mak made by Astro-Physics - a scope that you would be lucky to get for $20,000.
Now - he would sell it to me today - but honestly, I just don't have the time or the space to take on another project, and I already have what I consider to be a world-class 10" reflector with custom made optics that I spent years perfecting. As wonderful as this scope must be, I just don't need it. But this is an historical scope and without doubt worth 5-10x what he is asking. His goal is to emgirate from Venezuela and he cannot do that before accounting for his grandfather's prized telescope. I would urge those of you with time, space, and cash to investigate this issue further.
(edit: Trust but verify of course. I say the guy is legit, but you must draw you own conclusions!)
Edited by deSitter, 10 March 2017 - 11:57 AM.