A rare Benjamin Franklin Z-grill stamp from 1868 could fetch as much as $5 million once it hits auction in New York. There are only two known stamps in existence.
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This Ultra-Rare Stamp Could Fetch a Record $5 Million at AuctionGross Collection of United States Stamps ... the ultra-rare collectible would become the most valuable American postage stamp to date. So, what makes the "Z" Grill lot so special?
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