Maker: USPS
Original Price: $0.24*
Worth Today: $1.593 million*

Also called the “Jenny Invert” or “Upside-Down Jenny,” the Inverted Jenny is a twenty-four-cent USPS postage stamp. It was issued in 1918, and it bears the image of a Curtiss JN-4 airplane. The plane was printed in error—it’s upside down. The flipped “Jenny” plane is one of the most famous errors in the history of American philately.

Only one pane of one-hundred of the Jenny Inverts was ever found, so the stamp is prized for its rarity. In 2007, a Jenny Invert sold for $977,500. Most recently, in 2018, a Jenny Invert sold for $1.593 million (including the buyer’s $243,000 premium).