Seikosha

Seikosha Co., Ltd. (精工舎, Seikōsha) was a branch of the Japanese company Seiko that produced clocks, watches, shutters, computer printers and other devices.

It was the root of the manufacturing companies of the Seiko Group.

Seiko Quartz Astron 35SQ , the world's first commercial quartz watch developed by Suwa Seikosha