Watch List notes:

Potosi, Bolivia, cob 8 reales, (1)642(FR), rare (missing in Sellschopp). S-P28; KM-19a; CT-487. 26.99 grams. Crude flan of varying thickness resulting in peripheral flatness, slightly doubled shield with small black spots, but best feature is the bold date that appears as "(1)644Z" due to doubling, VF or so for actual wear.

Estimate: $250 - 375