Watch List notes:

Potosi, Bolivia, cob 4 reales, Philip II, assayer B/A (4th period), very rare. S-P12; KM-unl (4.2 for type). 13.05 grams. Full crown and shield and cross with fine details, XF with light toning, slightly uneven strike, clear P-B/A (decidedly not A/B) and denomination, first we have ever seen.
($250-500)