World's rarest stamps - The Postal Museum

There are some stamps in the world that are so rare they are priceless, but what makes a stamp rare in the first place?

The 10 Most Valuable U.S. Stamps

21 Most Valuable Stamps: Rare Stamps Wanted By Collectors, 45% OFF

Earliest Letter Using Adhesive Postage Stamp on Sale for $2.5 Million

Auction watch: The world's most valuable stamp (it's the ugly one) – Punk Philatelist

Most Expensive and Valuable Stamps of Czech Republic

Rare stamp on ballot a fake

The Six Most Valuable US Postal Stamps That Sell For Up To, 48% OFF

The Six Most Valuable US Postal Stamps That Sell For Up To, 48% OFF

The Most Valuable Stamps in the World

World's Rarest Stamps The Postal Museum, 47% OFF

He Owns World Famous Stamps and a Prized Coin. Now He's Selling. - The New York Times