Grandmaster Chime Watch from Patek Philippe
The Grandmaster Chime Watch was designed by Patek Philippe and is considered the most complicated watch the company made. It’s now worth about $30 million because the brand only produced seven of them. See one in Switzerland at the Patek Philippe Museum.
Inverted Jenny Stamp
The USPS created the 24-cent stamp that most people call the “Jenny Invert” or the “Upside-down Jenny.” Issued in 1918, it shows a picture of the Curtiss JN-4 plane, though it was printed upside down. It’s extremely rare, and one went for about $1.5 million in 2018.