When: 1913 Why: Officially first commercially produced 35mm film camera.
It did not gain a lot of popularity like "Leica I", but New Ideas Manufacturing (part of a Herbert & Huesgen, American company) produced almost 1000 cameras. And... Hold your breath: it was capable of taking 750 exposures per one film load. Body looked like a movie camera.
Several months later, the first 35mm stereo camera was manufactured by Jules Richard (France). It was "Homeos" which will be covered in one of the next posts.