Sweden Three Skilling Banco ($2.3 Million)

The rarest postage stamp of all time, Sweden’s three schilling banco, also known as Treskilling Yellow. Literally only one of these stamps is known to exist. They were produced in 1855, back when Sweden was rolling out their very first postage stamps. The three-skilling stamp was meant to be printed in blue while the eight-skilling stamp was supposed to be printed in yellow. These yellow three skilling stamps, then, exist as a result of total error. Although it’s possible that many yellow three skilling stamps were produced, only one has ever been found today. The single stamp has been put up for auction multiple times over the years, and its value currently floats at around $2.3 million, making it the rarest and most expensive postage stamp of all time. https://www.facebook.com/photo.php?fbid=1428284080527388&set=a.1330075460348251.1073741826.100000374286732&type=3