The Nikon S3 is a professional level, interchangeable lens, 35mm film, rangefinder camera introduced in 1958. It was manufactured by the Japanese optics company Nippon Kogaku K. K.
The S3 is mechanically similar to the Nikon SP except for a simplified viewfinder system. The viewfinder does not compensate for parallax error and the framelines are fixed (etched).
In 2000, Nikon introduced an updated, hand-assembled S3 model to celebrate the new millenium. It was quite a production to produce S3s again, as all the original dies were long gone. The new Nikkor 50mm f/1.4 lens for the new S3 is noticeably larger than original 50mm f/1.4 lenses.