Published in Spring 1995 Zeiss Historica Journal
Author: Charles Barringer
See Page 8 – 9.
On many of the glass products of Carl Zeiss Jena and Zeiss Ikon, there are very tiny versions of those firms’ trademarks either etched or molded into the glass itself. It is shown here on photo filters but it also appeared on spectacle lenses.
To go to the Journal itself, click on the year 1995 in the first line above.