Map of the World : Eastern and Western Hemispheres (c.1820) 74mm diameter undated, in white metal by T.Halliday, possibly struck by Edward Thomason, Eimer 1139a, Obverse: Detailed Map of the Eastern Hemisphere, the continents AFRICA, ASIA, EUROPE and NEW HOLLAND (Australia) identified together with countries and some cities, Reverse: Detailed map of North and South America identified, together with countries and islands GEF boxed with good surfaces, rare