Watch List notes:

George III or IV, Map of the World, white metal medal, c. 1820, believed by Thomas Halliday and possibly struck by Sir Edward Thomason, the Eastern and Western Hemispheres to either side, the Eastern showing Africa, Europe, Asia and for Australia - New Holland, the Western showing North and South America, New Zealand and the islands of the Pacific, 74mm. (BHM.-; Eimer 1139), in fitted case (catch broken), extremely fine and rare
(Estimate: 300-500 GBP)