This gorgeous German 6x9 folding camera is from the late 1930s or early 1940s, and isn't even a rangefinder: you get to measure the distance to your subject (though thankfully there's a handy DoF table on the back).
Winding is also fully manual, meaning you have to judge when you've wound the film far enough for a new frame, while not overlapping the previous exposure.
It does, however, give you the option to shoot 6x4.5 instead of 6x9, complete with a flip-up mask in the viewfinder. Brilliantly designed, especially for its age.
Text and photo: by Dan Rubin @ Flickr
See also: Camerapedia article