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Jim VBI have no direct knowledge of these cards and hesitate to muck up the water, but here goes...
Pending any statement from GAI, is it possible that these were a mock up, made by Goudey, using old cards as a backing, with a "proof" front applied over the old card.
Of course, to make that determination, you'd need some pretty solid provenance from the seller, from GAI or from Goudey.
Hard to believe they have existed for 70 years and are just surfacing now.