Seiko sells jewelries.
, more commonly known simply as Seiko ( [ ˈseɪkoʊ ] ) , is a Japanese holding company that holds subsidiaries which manufactures and sells watches , clocks , electronic devices , semiconductors , jewelries , and optical products . ( Epson being an abbreviation for `` Son of Electronic Printer '' ) , or simply Epson , is a Japanese electronics company and one of the world 's largest manufacturers of computer printers , and information and imaging related equipment .