A rare 1897 10 cents-on-9-Candareen dark green Dragons ... the 1918 24-cent Inverted Jenny is one of the most famous stamps in all philately. There are at least 86 known in existence (only 100 ...

Here’s a look at some of the 12 most valuable American stamps that are still out there, waiting to be discovered by lucky collectors. Learn: 10 Rare Roosevelt Dimes Worth a Lot of Money Also ...