I suspect this is from an ad piece, there are several cards that appear cut from an advertisement to me. They are missing the 'Red Cross Long Cut' beneath the image, and have a brownish/golddish frame around the image, and blank backs. They have a creamer appearance more than white. Looks like this might be a trimmed down version of one of those, to me. I doubt it is an actual proof.
EDIT: Very cool card!
Last edited by G1911; 10-22-2021 at 11:12 PM.
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