Canon Mirror Lens 3.8/800mm

extremely rare and impressive ultra-telephoto mirror lens, very bright maximal aperture F:3.8, made by Canon to order only in 1960's, here in FL mount, was also available in mounts for motion picture cameras, Canon advertised this lens as a 'World Brightest Lens' and it was shown in very few brochures along with the infamous 11/2000 and 14/5200mm mirror lenses, length 58cm inkl. camera mount, weight 15kg, the lens is in beautiful, probably unused condition, perfect optics, incl. large metal front cap, in original aluminium carrying case, only few of these lenses are known to exist and no recent sales are known