Seiko Watches is perhaps best known for its wristwatches, all of which were at one time produced entirely in-house. This includes not only major items such as microgears, motors, hands, crystal oscillators, batteries, sensors, LCDs but also minor items such as the oils used in lubricating the watches and the luminous compounds used on the hands and the dials. Seiko watches were originally produced by two different subsidiaries. One was Diani Seikosha Co.,(now known as Seiko Instruments Inc.), and the other was Suwa Seikosha Co.(now known as Seiko Epson Corporation). Having two companies both producing the same brand of watch enabled Seiko to improve technology through competition and hedge risk. It also reduced risk of production problems, since one company can increase production in the case of decreased production in the other party.
Seiko produces watches with quartz, kinetic, solar, and mechanical watches of varying prices in Japan and the international market. Seiko Corporation of America is responsible for distribution of Seiko watches and clocks, as well as Pulsar brand watches, in the United States. The models available in the United States are normally a smaller subset of the full line produced in Japan. Seiko Corporation of America has its headquarters (and Coserv repair center) in Mahwah, New Jersey. In the United States, Seiko watches are sold primarily by fine jewelers and department stores as well as 19 company stores located in various cities.