The camera on the picture is Canonet QL17 GIII. This is really famous camera. Canonets, different models, use to be very popular back in 60th/70th and production went high. Count for GIII is around 1.2 million copies. That is why they are so cheap now ($20-$100 on Ebay, depends on condition). GIII is the top camera of the line. Canon started making Canonets (not expensive high quality partially automated rangefinders, shutter-in the lens design) January l961.Here is all the data:

Camerapedia on Canonet GIII QL-17

I bought my first Canonet Feb 2004. Then, when the shutter has broke in 2005, I bought it again. Sometimes I use auto feature (shutter priority), but mostly shoot on manual.
The camera is highly recommended:

• Viewfinder is bright and big
• Shutter is quiet
• 40mm F1.7 lens is super sharp
• Rangefinder itself is a top-notch
• QL stans for "Quick Load" feature

Of course it is an old camera, it could develop some problems (mostly shutter). But it always can be replaced. It is a shame not to have one in your bag.