Issued by Deutsche Bundespost in 1966, this 30 Pfennig green stamp features the historic Town Hall of Flensburg, located in Schleswig-Holstein near the Danish border. The design belongs to the long-running “Historic Buildings” definitive series, which showcased notable German architecture. The Flensburg Rathaus, with its stepped gable and clock tower, exemplifies the region’s distinctive North German brick style. These definitives were widely used across West Germany, making them a staple of mid-20th-century postal history.