Ur Leica 1914
Leica 0 1920
Leica 1A 1925-1932
Leica Standard, first screw mount Leica 1931-1933
Leica1 shutter drawing by Ali Afshari, from the book: "Leica Design 101". This idea (Patent No. 235,560 filed in 06/16/1924), made camera design sequential, and had great influence on the rest of cameras specially the SLR.
Leica IID with built-in rangefinder 1932-1948
Leica IIIf 1950-1957
Leica IIIg 1957-1960
Leica IIIC with Motor 1938