This is the Yashica J, released in 1961, is a rather nice little rangefinder from Japan. It's not a high-end model, but more of a basic without the light metre of other Yashicas at the time.
Format: 35mm film
Lens: Fixed, 45mm, f2.8
Shutter: Blade, B - 1/300
I shot my first roll on this a couple of days ago, and I must say I love the look it gives the photos. It's a slightly low contrast with nice shallow depth of field. All the photos I took were in focus and well exposed (which kind of surprised me) and I got some good shots from it!