Nowadays, only two of these blue stamps are known to exist, making them incredibly rare. The most recent one to be put to auction was in a Dreyfuss sale in 2011 and sold for about $2.5 million.

It's believed that most of these stamps were destroyed, except for a single mythic sheet of 100 stamps sold by a postal clerk in Washington, DC. In 2023, one Inverted Jenny sold for $2 million at ...