Watch List notes:

Potosi, Bolivia, 1/2 sol, 1827JM, "CONSTITUCI" error, encapsulated NGC MS 63, rare first year. KM-93.1. Perfect bold strike (full details), gorgeous rainbow toning with underlying luster, a lovely gem with interesting error, undergraded in our opinion (hard to imagine what the single MS 65 and MS 67 on record look like when this coin is so choice!).

Estimate: $600