It released its first Citizen-branded pocket watch in 1924, and Citizen Watch was formally established in 1930. The house made its name on quartz: in 1975 it introduced the Crystron Mega, then the world's most accurate wristwatch, and in 1976 the Crystron Solar Cell, the world's first analog solar-powered quartz wristwatch.
Its defining innovation came in 1995 with Eco-Drive, the first system to conceal a solar cell beneath the dial — by 2015 roughly 80 per cent of its watches used it. In 2019 it released, under The Citizen brand, a watch powered by the Caliber 0100, billed as the most accurate movement ever created. Beyond watches, the group makes calculators, printers and precision machining equipment, and is the parent of American watchmaker Bulova.