“…The inventor of the stamp is a debated subject, with various people claiming to have come up with the concept. Whoever the evidence may point to, the subsequent production of the small rectangular adhesive paper attachable to an envelope is now a lucrative business, although it probably took a hit when email came along. With tens of millions of stamp collectors in the United States alone, it is one of the most popular hobbies in the world…” — Epoch Times
above: George Washington postage stamp from 1847, est. value of $35,000