Nikon
Founded as Nippon Kogaku in Tokyo; the Nikon F reflex camera (1959) became standard among press photographers.
Nippon Kogaku was formed by a merger of optical companies in Tokyo and made binoculars and optics for the navy. After the war the company turned to cameras and lenses for the civilian market.
The Nikon F of 1959 was a system camera with interchangeable parts, and it was used by press photographers during the Vietnam War. Nikon became the company's name in 1988.
Nippon Kogaku on older cameras and lenses; serial number on the body.