The CM-3 is a 35mm film SLR camera from Chinon. It has a near twin in the Chinon AM-3 and CM-1, but there are small styling differences.
These models accept 42mm screw lenses and the user activates stop down metering with a half press on the shutter release. Colored LEDs on the right edge of the viewfinder eyepiece indicate under/correct/over exposure for the current camera settings.
I have purchased it to pair it with my M42 lens, Helios 44-2 2/58 58mm F/2, through the time I also added Helios 28mm F/2.8 and Makinon Zoom 35-105mm F/3.5