A similar jug with a silver mount is in the Winkworth Collection, illustrated in Soame Jenyns, "Japanese Porcelain", plate 58B ii.
There were two lines to the rulers of Brunswick (Brunswick-Wolfenbüttel and Brunswick-Lüneburg). These later merged under the title of the Electors of Hanover, from whom the Georgian Kings of England were descended. George I of England also carried the title Duke of Brunswick and Lüneburg.