setting the record for the most expensive single US stamp sold. The famous red, white and blue "Inverted Jenny" stamp dates back to 1918 and originally cost 24 cents. Its fame is tied to both its ...

One sold for £400,000 in 2010 ($535,000 today). William H. Gross was a famous stamp collector, and this 2 cents Hawaiian Missionary stamp was the most valuable stamp in his collection.