The Yashica Electro GSN is a rangefinder that was in production from 1971 to 1974.  It was one of the first cameras to employ warning lights for over/under exposures.  A red light indicates the image will be over exposed at the chosen aperture setting.  The yellow light means that the use of a tripod is recommended.  No light means you're good to go.  There's also a battery check light, which is very handy.

This camera is set up for aperture priority.  That means when the desired f stop is set, the camera will automatically pick the appropriate shutter speed for you.  The viewfinder is very bright, the lens is clear/scratch free, and the electronics seem to be working just fine.  Not a bad deal for 25 bucks.  

The last two images of this series were taken with the wide angle attachment screwed on to the front of the lens.  I either did something seriously wrong when installing it, or the lens itself is causing the unpredictable results.  Other images from this roll can be found on my dad blog by clicking here.