John, yours are the only W560 cards with anything but a blank back that I have seen (while casually checking W560's over the decades). Great find...I missed this thread previously.
My guess is the Newark Centre Market had a whole mess of W560 strips hanging around and they thought that adding advertising to the backs would be a great way to attract attention to their event. Definitely falls within the updated 1929 or later time frame for these cards.
Brian
Last edited by brianp-beme; 06-22-2024 at 03:11 PM.
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