Hamburg – Flag in Lexicon and Shop https://www.flaggenlexikon.de/fdthambu_me.htm
The city of Hamburg and its surrounding area is a former federal state of the German Empire and since 1949 a federal state of the Federal Republic of Germany. The flag – which can also be ordered on these pages – shows on a red bunting a castle with three towers and a gate.
1770 · Hamburg receives a seat and a vote in the Reichstag