1961 Leica M3 was introduced in 1954.
Parallax correcting bright line finders for 50, 90 and 135mm bayonet
mounted lenses are viewed through a combined viewfinder/rangefinder
window. Different brightlines can be previewed by moving the small
lever opposite the self timer. The rear of the camera is hinged for
easy film loading and the film is wound on with a short stroke lever.
The film counter automatically resets when a new roll of film is
loaded. The ultimate 35mm rangefinder camera. This one has an f2
/ 50mm Summicron attached.