The most expensive stamp in the world is the British Guiana 1c Magenta. It was issued in British Guiana (now Guiana) in 1856 and it is believed that only 1 now exists. The stamp has an intriguing history that can be traced back to 1873 when a 12 year old Scottish schoolboy found the stamp attached to an envelope on one of his uncles letters. He sold the stamp to a collector for six shillings. 6 years later the very same stamp was sold for 120 pounds, then later that year was sold again for 180 pounds. Over the next 100 years it has been bought and sold a number of times with an always increasing price tag. In June 2014 the stamp broke all records selling at auction for US$9’480’000 making it the most expensive stamp in the world.