A Treskilling Yellow is a rare Swedish postage stamp that was printed in the wrong color. The stamp was supposed to be green, but due to a printing error, it came out yellow instead. This mistake made the stamp extremely valuable to collectors, as it is the only known example of its kind.

In 1996, a Treskilling Yellow stamp sold at an auction for over $2 million, making it one of the most expensive stamps ever sold. The stamp's high value is due to its rarity and the fact that it is considered a major philatelic error.

There are only a few Treskilling Yellow stamps known to exist, which adds to their desirability among collectors. The stamp was first discovered in the 1880s by a young collector named Georg Wilhelm Backman. He found the stamp in a mixture of other stamps and realized its significance.

The Treskilling Yellow stamp features a portrait of King Oscar II of Sweden and has a denomination of three skillings, which was the standard postal rate at the time. The stamp was issued in 1855, and it is believed that the printing error occurred when the yellow ink used for another stamp bled onto the Treskilling Yellow sheet.

Since the sale of the Treskilling Yellow in 1996, the stamp has become a symbol of rarity and value in the world of philately. Collectors continue to search for other examples of the stamp, but so far, only a handful have been found.

Overall, the Treskilling Yellow is a fascinating piece of postal history that has captured the imagination of collectors around the world. Its high price tag and unique status make it a coveted item for those who appreciate the art and history of stamp collecting.

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