Published in Spring 1983 Zeiss Historica Journal
Author: Hans-Juergen Kuc
See Page 3.
An early reference to a prototype camera marked Contaflex but obviously one for the eventual Contarex Bullseye camera of the post war period. Since it is a prototype, it is not fully representative of the ultimate production camera . Now some 30 years later, other prototypes of the period have not really been found.
To go to the Journal itself, click on the year, 1983 in the first line above.