🌎 Country

Sweden

📅 Year

1855

💰 Denomination

3 sk

📮 Issue type

Definitive

🖼 Topic

Heraldry & Numerals

Sweden's first stamps showed the national coat of arms, and the three-skilling value was meant to be blue-green. This one was printed in the yellow of the eight-skilling by mistake. Only one copy is known, found by a schoolboy in 1886, and it has several times been the most expensive stamp in the world.

Picture: Wikimedia Commons · Public domain