Ten Most Valuable Postage Stamps. Postage stamps commemorate the people and events that shape the United States. It gets the moniker "Black Jack" from its background and use and filling or outlining some of the letters in black.

Stamp collecting was once a hugely common popular hobby but its popularity has declined over the years as a rise in modern technology has taken over the use of letters.
Most postage stamps that have been used are worth only pennies.
Post Office Mauritius is an error postal stamp issued in Mauritius. Using stamps to mail a letter or package can be tricky, but it doesn't have to be a cause for frustration. This is a list of postage stamps that are especially notable in some way, often due to antiquity or a postage stamp error.