Watch List notes:

Buenos Aires, Argentina, copper 1/4 real, 1827, NGC MS 62 BN, ex-O'Brien. Janson-13; KM-2. Rainbow toned over luster, scarce one-year type, second finest (O'Brien: "finest seen") in current NGC census behind a single MS 64. Pedigreed to the John O'Brien Collection (stated on label), with his tag.

Estimate: $400 - $600