On 25 March, Åland Post issues a stamp in the 2021 Sepac series on the theme historical maps issued by the small European postal administrations. The Åland contribution shows a nautical chart from 1747 of Rödhamn, a group of islets located off Mariehamn, close to a major waterway. For centuries, Rödhamn has served as a sheltered harbour for seafarers.