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I am /p/'s Soviet cam ambassador.
That's a FED-3, Soviet rangefinder camera. It's the successor to the ubiquitous FED-2. There's not much difference between it and the FED-2. The mechanisms are essentially the same.
One big important thing, do not fire the shutter, then change the shutter speed before cocking the shutter, this can damage it, it's a known issue on many Soviet cams though none of my FED-2's or my 5c ever did it.
The lens appears to be a lanthanum Industar 61 L/Z it's radioactive but you'll have to stand in front of it for hundreds of years before it kills you. It's fairly sharp but won't hold a candle to a Jupiter lens. It's a screw-mount M39 Leica Thread Mount (LTM) lens and there are a few attachments for them.
Should you shoot with it? Absolutely, once CLA'd they make excellent shooters and if you aren't comfortable with all the online guides for a DIY CLA (which I used to do my FED-5c and FED-2) send it to Fedka and Yuri will take care of you, he's been fixing these things forever. He's a bit slow but he does meticulous work and has done two of my older FED cameras. Check the shutter speeds on it, and then check the shutter for pinhole leaks using a flashlight. If it checks out, shoot with it and post back results.
You won't get Leica quality but you'll get the Leica experience for 1/10,000th of the cost, since they are based on the Leica IIc design from the 1930s.
