Potosi, Bolivia, cob 1/2 real, Philip II, assayer A to left, ex-Bir. S-P11; KM-1.3; CT-722. 1.85 grams. Choice full monogram with bold A to left (no mintmark), superb full cross-lions-castles with light surface porosity on that side only, XF overall, mostly nicely toned. Pedigreed to the Mark Bir collection (our auction #6, with original lot-tag #958), with Mark's original tag. (Estimate: $125 - 200)