Watch List notes:

Buenos Aires, Argentina, copper 1/2 real (5/10), 1840, NGC MS 64 RB, finest known in NGC census, ex-O'Brien. Janson-17.1.3; KM-6. Finest known for the type in the NGC census and the first example designated Red-Brown (all others have been Brown), with much original luster and color (particularly in the peripheries), bold strike with minor die-cracks but no marks or wear, Interesting one-year type with legend VIVA LA CONFEDERACION! NGC #4771567-004. Pedigreed to the John O'Brien collection (stated on label).
($150-$225)