Citizen Watch Co., Ltd., also known as the Citizen Group, is an electronics company primarily known for its watches and is the core company of a Japanese global corporate group based in Nishitokyo, Tokyo, Japan. In addition to Citizen brand watches, it is the parent of American watch company Bulova. Beyond watches, Citizen also manufactures calculators, printers, health care devices, and precision CNC machining equipment. Citizen Watch built upon the achievements of the quartz revolution initiated by Seiko in 1969, focusing on the further development of quartz technology to improve both accuracy and efficiency. In 1975, it introduced the Crystron Mega, then the world's most accurate wristwatch with an annual deviation of ±3 seconds. In 1976, it released the Crystron Solar Cell, the world's first analog solar-powered quartz wristwatch. In 1995, Citizen introduced Eco-Drive, the world's first system to incorporate a solar cell concealed beneath the dial. By 2015, approximately 80 percent of the company's watches utilized Eco-Drive technology. Wikipedia