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This Ultra-Rare Stamp Could Fetch a Record $5 Million at Auction
Several stamps are expected to hammer down for more than $1 million, with the rarest being one of two known one-cent "Z" Grill stamps from 1868. If sold for its estimate of $4 to $5 million ...
Precious US stamp from 1868 expected to sell for eye-popping sum: 'Rarest of the rare'
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.