this item is called by the City of London authorities a "Muscovy hat" and is a historic reference to the medieval trade with the Baltic. In the 17th and 18th centuries, a Muscovy hat was sometimes depicted above the coat of arms of the City of London, in place of the more conventional helm and crest of a dragon's wing charged with a red cross.

The confusion as to nomenclature stems from references in early borough charters granting the