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." ...

For over 180 years, we’ve been collecting stamps, and philatelists have put a high price on the rarest of the rare stamps, from hundreds of thousands to millions of dollars. These are the most ...

The stamp, seen here with Siegel Auctions President Scott Trepel, once famously featured in an episode of the Simpsons A rare US postage stamp has sold for $2m (£1.63m) in a New York auction ...