SCOTT TREPEL: Well, the stamp that we sold for $2 million is the Inverted Jenny, and it is the icon of stamp collecting. ... TREPEL: There's still one stamp out there that was stolen in the 1950s.

Though a similar stamp sold for nearly $1 million last year, ... It is a red and blue stamp with an upside-down image of a Curtiss JN-4H biplane. ... Scoping Out Stamps.

Doomscrolling is out. Stamp collecting is in, and these are the most valuable stamps that collectors keep showing up for.