While it might seem like all the valuable stamps have already been discovered, history has shown us that rare and valuable stamps can still be found in the most unexpected places, including everyday mail.
While most were quickly recalled, a few made it into circulation. While finding an Inverted Jenny in modern mail is virtually impossible, its story serves as an inspiration to keep an eye out for printing errors on stamps, which can be highly valuable.
Considered the world’s rarest stamp, the British Guiana 1c Magenta was printed in limited quantities in 1856 due to a shortage of stamps from England. Only one specimen is known to exist today.
The Treskilling Yellow holds the record for being one of the most valuable stamps due to a color printing error. It was supposed to be green, but a few were printed in yellow. Only one example is known to exist, making it extremely rare.
Errors and limited-issue stamps still make their way into circulation, and with a keen eye, you might just discover a rarity hiding in plain sight. Whether you're a seasoned collector or a curious newcomer, the hunt for these hidden treasures continues to captivate and delight.