Watch List notes:

Potosi, Bolivia, cob 1/2 real, (1656), special type with monogram inside cross, Calico and Mastalir Plate Coin. S-P37a; KM-13; CT-1169. 1.75 grams. Very broad, round flan and Royal-like strike (albeit slightly off-center) with full monogram and cross, full PHILIPPVS IIII, deeply toned VF. Plate Coin in Mastalir's The Great Transition at the Potosi Mint, Volume II (2016), page 285, and in Calico's Numismatica espanola (2001), page 350. (Estimate: $200 - 300)