Yashica "J" 35mm Rangefinder camera
I am assuming the model is "J"; there is no other model designation on the camera. It has a Yashinon f/2.8, 4.5cm (45mm for the metrically challenged!) lens. Shutter speeds are 1/300-1/25 plus "B". Focus is marked to 3.5 feet. No hot shoe, but it does have an "X" sync PC connection. The coupled rangefinder is fairly bright and follows the focus smoothly.
Overall this is a nice clean camera. I have not "real-world" tested it, but I've checked out the operation and controls, and everything appears to be functional, even the self-timer. The shutter speeds 'sound' good. Since this is a totally mechanical camera (no battery required), this is the one you but in the bottom of your kit for those times when that $3K digital camera craps out!