This is a 3″ by 5″ guarantee card for a R-37 projector.
From my private collection.
Keystone Guarantee Card
Collecting Keystone
The History of Keystone Manufacturing Company From 1919 to 1967
The History of Keystone Manufacturing Company From 1919 to 1967
This is a 3″ by 5″ guarantee card for a R-37 projector.
From my private collection.