1783 Treaty of Paris Medal. White Metal, with Copper Plug. 43 mm. By Johann Leonhard Oexlein. Betts-610; Eimer-804; BHM-255. MS-63 (NGC).Choice semi-reflective surfaces, just slightly dulled in the open fields. A couple of rim voids, a result of a slightly underweight planchet, are visible at 6 oclock on both sides. The copper plug has protected this tin-based, and quite reactive, white metal piece from oxidation over the last 235 years - except for a tiny patch at about 4 oclock on the reverse. The 1783 Treaty of Paris, negotiated between the United States and Great Britain, ended the Revolutionary War and recognized American independence. Ex: Eric P. Newman Collection, and housed in a custom NGC slab noting its provenance.