Very rare 1000mm f 10 mirror lens made by Sea Gull in Shanghai. All metal construction, following old Soviet MTO 1000 lenses. The lens has a sturdy tripod mount and an odd focusing bellows in the rear with meter scale. The lens comes with yellow filter, sunshade and wooden case. Minolta MD mount. These lenses were primary made for the Chinese Army and were not sold to the consumer public. Production Year: 1968.