Watch List notes:

Potosi, Bolivia, cob 1/2 real Heart, 1737, extremely rare. Janson-C47.10; KM-unl.; CT-unl. 1.55 grams. The rarest denomination of Hearts, by far, is the 1/2 real, of which only four specimens across all dates are known to us. The present lot is arguably the boldest of the five, an attractively toned XF+ with incredibly full and well-detailed cross-lions-castles, choice full monogram above full date, even two choice full crowns neatly placed just inside the top stem (holed there as usual, but the hole very small), the axes in perfect alignment and well centered. In short it is one of the best-executed Hearts of all time (not just for this denomination), its unlimited value restricted only by its diminutive size.

Estimate: $7500