Original Rolleiflex K1 @ 1928

Original Rolleiflex 6x6 K1

Model 610 (prototype)
December 1928, 10 pieces
Model 611
January 1929 - July 1929, 2500 pieces
Model 612
April 1929 - July 1929, 820 pieces
Model 613
August 1929-Febr.1932, 10850 pieces
Model 614
August 1929-Febr.1932, 21000 pieces
Serials (all models): 1 - 1999.999

Taking Lens:
Zeiss Tessar 4,5/75 (model 611,613)
Zeiss Tessar 3,8/75 (model 612,614)
Filter size 28,5mm
Finder lens:
Heidoscop Anastigmat 3,1/75mm
Filter size 24mm
Shutter: Compur, 1 - 1/300 sec., T & B
Film: 6x6, B I (117)
Film Transportation: winding knob, red window for exposure number on back, film pressure plate without color coating. Manual shutter tensioning.
Dimensions: 13.2x8.5x9.0cm
Weight: 715 grams (f 4.5), 722 grams (f3.8).

This model did not have a hinged back. The camera was often converted to accept the newer 620 and 120 roll films.