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In page District of Duchy of Lauenburg:

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The coat of arms was granted on 12 November 1866, after the Hohenzollern dynasty started to rule Saxe-Lauenburg in personal union with the Kingdom of Prussia. In 1876 the duchy was incorporated in a real union into Prussia, forming a district within the Prussian Province of Schleswig-Holstein. The usage of the coat of arms was discontinued, as then districts were not allowed to use coats of arms. Today the coat of arms is used by the district, displayed with a crown on top.[citation needed]