It was only in 1751 that the white castle on red was decreed as the flag of Hamburg.

This flag was created in 1897 on the occasion of the opening of the new town hall.

The Admiralty flag of Hamburg is used only for state buildings connected to the navigation and at the jacks of boats of Hamburg's Water Constabulary, since there are no genuine warships under city command anymore.

It portrays the admiralty coat of arms which have existed since 1642.

[2][3] Media related to Flags of Hamburg at Wikimedia Commons