A RECTANGULAR GOLD-MOUNTED ENAMEL AND GEM-SET TORTOISESHELL SNUFF-BOX, the cover with diamond-set Prince of Wales feathers, crown and 'ICH DIEN', for George Augustus Frederick, Prince of Wales, later King George IV, on an oval royal blue guilloché enamel medallion set in a rectangular engine-turned plaque, with reeded borders and gold lining, circa 1815