Most expensive banknote ever breaks its own record

The US 1890 Small Seal Grand Watermelon 1000 dollar note already held the record of most expensive banknote ever sold at an auction. But now this one of a kind note smashed its own record. It sold in 2006 for a record $2,225,000 but last night lot 17127 at Heritage Auctions sold for a whopping $3,290,000!

This note is signed by W.S. Rosecrans and E. H. Nebeker. This is the final iteration of the "Grand Watermelon" design. The note's nickname has been derived from the resemblance of the three large zeros on the back to watermelons. It is the only small seal Grand Watermelon of this type outside of government hands.