Argentina (Buenos Aires)
Buenos Aires, Argentina, 20 decimos, 1827, PCGS MS63BN, finest known in PCGS and NGC censuses, ex-O'Brien.Janson-3.1; KM-5.Dark all over but well struck and top grade, the best at NGC being MS 62.Pedigreed to the John O'Brien collection (stated on label).
Estimate: 600-900 USD