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 ...

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 valuable stamps from around the world. Value: $234,000 ...