Flown scientific return capsule carried on the Russian Cosmos 502 satellite, measuring approximately 12″ in diameter and 3.5″ thick, used for a scientific study of lubricant. Includes a letter from the Central Specialized Design Bureau, in part (translated): "1) Name: Scientific device container, KNA. 2) Intended use: was designed for work with materials, construction elements and instruments in open space. 3) Description: the first container of lubricating oils in open space. The container was carried into orbit on March 3, 1972 on board the satellite Kosmos-502." In very good to fine condition.
