The Penny Black, the world's first adhesive stamp used in a public postal system, was issued on May 1,1840 by t… | Penny black stamps, Stamp collecting, Penny black
The Penny Black - Home | Facebook
Sotheby's to Offer the World's First Postage Stamp: The First Penny Black | Press Release | Sotheby's
First penny black stamp could fetch up to £6m at auction | Stamps | The Guardian
Guide to Your Collection of Penny Black Stamps | Stamp Auction