the sport (camera) is the series production model of a prototype camera called gelveta. the gelveta was designed and built by a. o. gelgar between 1934 and 1935. it is the earliest known 35mm slr camera ever to be built, but fewer than 200 examples were made. it was manufactured by the soviet camera factory gosudarstvennyi optiko-mekhanicheskii zavod, the state optical-mechanical factory in leningrad. gomz for short. the camera name is engraved in cyrillic on the finder housing above the lens: „спорт“. the manufacturer's prism logo in gold on black with the factory initials гомз (gomz) is shown behind a circular magnifying window on the top left camera front. an estimated number of 16,000 cameras were made