Panama (struck at the Philadelphia mint), copper-nickel 1/2 centesimo, 1907, doubled die obverse error, encapsulated NGC MS 66, ex-Richard Stuart (stated inside slab). KM-6. Golden toning and luster, no marks at all, tied with one other for finest known in NGC census (above 97 others at current count). NGC #4427874-008. Pedigreed to the Richard Stuart collection. (Estimate: $100 - 150)