What is the most expensive stamp in the world?

United States
January 5, 2007 11:36am CST
In 1855 in Sweden someone goofed, printing a three skilling stamp on yellow/orange stock rather than green as it should have been. It is not known how many were printed, but only 1 copy is known to exist. In 1996 the 'Tre Skilling Banco yellow' was sold for $2,300,000.00
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@Lydia1901 (16351)
• United States
9 Jan 07
Wow, tahat is one expensive stamp. I don't think I'd buy it though, it's a bit expensive for me.