Believe it or not this one stamp is the world's most expensive stamp! In 1996, it stunned the philatelic world by reaching a hammer price of $2.3 million at a David Feldman auction in Zurich, Switzerland. By calculating its insignificant weight, this must be the world's most valuable thing on Earth at $85.98 billion per kilogram! It is generally proposed that when the printing of the yellow 8 Skilling Banco was underway, one of the printing clichés was damaged and had to be replaced in the forme. In error, a 3 Skilling Banco printing cliché was possibly inserted. In May 2010, David Feldman will one more time have the honour to sell this stamp and I wonder how much the hammer price will be. Please visit his website here: David Feldman. More information about the tre skilling stamp error and other rare stamps, read Glen Stephens' article in his website.