Watch List notes:

Potosi, Bolivia, cob 4 reales, 1641 (FR), extremely rare. S-P28; KM-17a; Cal-unl. 13.04 grams. Chaotically double-struck Fine with bold full 164 of date and bottom of 1 of final digit (not 100% certain), assayer not visible but only FR is known for this date, toned all over, very crude but rather important as a dated coin from this period.
($250-375)