$2,576,600 The rarest and mysterious stamp of Sicily is the error of color of 1/2 grana. The stamp was supposed to be issued in orange color, but instead, in 1859, it was mistakenly issued in blue. This error, combined with its scarcity, contributes to its allure among collectors. The Sicilian Error of Color stands as a testament to the unpredictable twists of philatelic history, captivating enthusiasts and sparking intrigue across generations (Getty Images)