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Precious US stamp from 1868 expected to sell for eye-popping sum: 'Rarest of the rare'Auction house Director Charles Shreve called Gross' collection, "without question, the most significant and most valuable collection of United States stamps formed this past half century." ...
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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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