Watch List notes:

Potosi, Bolivia, cob 4 reales, 1664E. S-P37a; KM-18; CT-756. 13.56 grams. Broad flan with some bold legend including date and king's ordinal IIII, second date below cross, two bold mintmarks, 100% full pillars but centers flat, otherwise VF with toned fields. (Estimate: $175 - 250)