This is actually a glass plate positive 3 1/4X4 1/4. My mother, Beth Strange, stands on the wing of a Waco biplane in Portalnd, Me. 1937, photographed by Kahill Studios. This plate is framed on top of a polished copper back plate so that it resembles a tin type and was thought to be one until I took it apart a few years ago. I don't know it the plate is a camera original processed to a positive, or a contact print on a glass plate of a camera negative. Maybe you smart guys have seen images like this before and know how it was done.
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