Asking for info on the “poster” or advertisement piece. I am guessing it came inside the full box of cards on top. Used by the retailer to promote the new inserts to increase sales and interest How rare are they? I have had the please if looking at many Mantle and Koufax threads and don’t recall seeing this piece in any collection. Are they callled “box toppers” ? Are there other ones out there promoting 68 game cards, 66 rub offs, 63 peel offs etc.
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