Rolleiflex 4×4 @ 1938

Rolleiflex 4x4 Baby Rolleiflex "Sport"
Model 4RF 430
June 1938 - February 1941
Serials: 622.000 - 733.000
Taking Lens:
Zeiss Jena Tessar 2,8/60
Bayonet 1
Finder lens:
Heidoscop Anastigmat 2,8/60mm
Shutter:
Compur Rapid, 1 - 1/500 sec., T & B.
Film: 4x4, Type 127 (A8).
Film Transportation: winding lever with red window for first exposure on back of camera, counter window for exposures 2-12. Blank film pressure plate.
Dimensions: 11.3x7.5x7.9cm.
Weight: 580 grams.

Reportedly, but not clearly documented by Rollei, about 1,000 more of this camera model have been built in war time from 1941 - 1943 with serial from 850.000.
This camera model could be used with a glass plate film adapter; but it can not be modernized.