Published in Spring 1991 Zeiss Historica Journal
Author: Charles Barringer
See Page 7 – 9
The author discusses the use of this design and trademark which was originally purposefully designed for us in the esoteric world of photogrammetry but came to become multiple prototypes for the Contax rangefinder with some actual examples that came to market.
To go to the Journal itself, click on the year 1991 in the first line above.