1783 Treaty of Paris Medal. Betts-610, Eimer-804, BHM-255, Van Loon-592. White Metal, with Copper Plug. MS-62 (PCGS).43 mm. Brilliant satin to reflective surfaces are untoned with no defects of note. The tiny copper plug, used as an electrolyte in this medal, has done its job over the centuries preventing the tinpest oxidation so prevalent for medals of this composition. One of the most famous medals celebrating the Treaty of Paris, signed by representatives of Great Britains King George III and the United States on September 3, 1783, ending the American Revolutionary War. The Dutch government presented a tin impression to John Adams in 1787, which later found its way into the Massachusetts Historical Society collection.From the Martin Logies Collection.