Belgium 10c "Inverted Dendermonde"

Belgium · 1920 · 10c

This definitive stamp features a two-color design with a central vignette depicting the Dendermonde Town Hall. It is famous for a rare printing error where the brown central image was printed upside down in relation to the gray-blue frame. This error occurred on a small number of sheets, creating one of the world's most famous philatelic rarities.

Issued during the post-World War I period, the stamp was part of a series showcasing Belgian landmarks. The error was reportedly caused by a worker reinserting a printing plate incorrectly after a lunch break.