On 5/27/2020 7:18 PM, Dan Smith wrote:
WW2 as part of a project to develop clear plastic gunsights.
Google is my friend. It was
Eastman910 (or I guess E910)
-- Jon Miller For me time stopped in 1941 Digitrax Chief/Zephyr systems, JMRI User SPROG User NMRA Life member #2623 Member SFRH&MS