Treskilling Yellow

Issue Date	1855
Issuer	Sweden
Known For	Most expensive stamp in the world
Approximate Value	$2.5 million Swiss Francs (as of 1996)

History

The normal three skilling stamp printed in Sweden is colored green while the eight skilling stamp was printed in yellow. However, due to an unknown error (but most likely the three skilling plate was accidently replaced by an eight skilling one), the three skilling stamp was printed in yellow, creating the Treskilling Yellow Stamp.

The only known copy of the Treskilling Yellow was discovered by a schoolboy named Georg Wilhelm Baeckman in 1886 while going through his grandparents' attic.

To this date, this is the only copy known in existence and is worth about $80 billion/pound by weight - one of the most expensive objects in the world

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Inverted Jenny

Issue Date	May 10, 1918
Issuer	United States
Known For	Most famous error in American Stamps
Approximate Value	$525,000 US Dollars

The 24 cent Jenny Stamp was created for delivery of mail by air - a new concept in 1918. This is a large sum compared to the 3 cents that it costs for ground delivery. As a result, the stamp was created and printed in a hurry.

The Jenny Stamps were printed in sheets of 100, but each sheet had to be fed through the printing machine twice. Therefore, it's very easy to accidently flip the sheet on the second pass, and this is exactly what happened. One of these sheets were printed with the jenny plane upside down, and sold before it was noticed, creating the Inverted Jenny error.

The sheet of stamps were subsequently sold for ever higher amounts. Eventually, the sheet was broken up when the owner realized that the Inverted Jenny Stamps were worth more (resale wise) when separated.

A block of 4 stamps was purchased in 2005 for $2.9 million dollars.

Post Office Mauritius - Blue Penny / Red Penny

Issue Date	September 20, 1847
Issuer	United Kingdom of Great Britain and Ireland
Known For	Also known as Blue Penny/Red Penny, one of the rarest stamps in the world. Has the words "Post Office" instead of "Post Paid". First stamps of Britian to be produced outside of the United Kingdom.
Approximate Value	€1 million pounds sterling

History

A design created by Joseph Barnard (1816-1865), whose initials are engraved on the neck of the queen on Post Office Mauritius Stamps. A copper plate of 3.25 inches by 2.5 inches was used to engrave the design. 240 pieces of this stamp was sold before it was realized that words on the stamp should be "Post Paid" and not "Post Office".

There are only 26 known copies of the Post Office Mauritius Stamps that have survived to this day. One Penny: 12 cancelled, 2 mint. Two Penny: 6 cancelled, 6 mint. They are mostly in the hands of private collectors, but are on display at the British Museum in London and the Blue Penny Museum in Mauritius.

Mauritius was the 5th British colony (and country) to issue postage stamps.

Most of the stamps were sent out in some ball invitation letters sent out by Mauritius' governer's wife (Lady Gomm):

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