The Ricoh 500 G is a compact coupled rangefinder camera, introduced by Ricoh in 1972. It offers automatic shutter priority exposure, or fully manual control. A projected viewfinder needle pointer indicates the aperture the camera will set for any preferred shutter speed, or the aperture the user should set when on manual control.
It's similar in size to the Konica C35, and similar in features to the Olympus 35RC or Canonet QL28. In other words it has the advantage over the C35 of having full manual override in addition to the aperture priority settings.