There are others too...
http://www.ebay.com.au/sch/i.html?_s...ens%26_arr%3D1
I used to have an MTO-1000A, big and heavy but optically excellent - the secondary mirror is reasonably small and it served quite well as a small telescope. The lenses in the early ones (1958) weren't coated but later ones from the 1970's had MgF coatings.