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millerhouseLeon, if I understand what you wrote, anyone trying to pry the Clarke off of the front of an ad piece, hoping to obtain a complete H813-1, would be disappointed. The thickness of the card material attached to the ad piece is noticeably thinner than an actual 1912 Boston Garter card. Moreover, the actual 1912 cards are not blank-backed.
One other comment that bears mention from Barry Sloate's reference to the accordian-type multiple cards that have been found: A number of individual 1912s that have been offered over the years show roughness on the sides -- which is indicative of cards that were originally issued as part of a multiple-card accordian. They're reminiscent of separated T202 side panels.