Classic RF coupled black/chrome W-Komura 3.5/28mm lens for Leica M39 mount. Photo credit: © WestLicht Photographica Auction
Sankyō Kōki K.K. (三協光機㈱) was a Japanese optical company, which used the brand name Komura for a variety of lenses. The company's name usually appeared as Sankyo Kohki on English language product branding such as lens badges. However in English language trademark filings, the more conventional spelling of Sankyo Koki Co., Ltd. was often used.