Most Expensive Piece of Paper Currency:
1890 United States Small Seal $1000 Treasury Note
The only known copy of this piece is referred to as the “Grand Watermelon”, due to the uncanny resemblance of the 0’s on the reverse side of the note to watermelons. And once again we see the magical number “200”, which is the number of banknotes that were originally printed.
Most Expensive Coin:
723 (A.D.) Umayyad Gold Dollar
From banknotes to pennies! Okay, not exactly. A 12-centuries-old Umayyad dinar is the most valuable coin in the whole world. Right after a one-tonne gold Kangaroo coin, but comparing these two would be cheating. You can’t even fit a 2000 lbs coin in your pocket anyway! The Umayyad dinar was purchased in 2011 at a Morten & Eden auction by an anonymous buyer for 6 million bucks, and has not been seen in public since.