Potosi, Bolivia, cob 8 reales, Philip IV, assayer T (ca. 1629), ex-Panama hoard, mounted cross-side out in silver bezel with 14K gold prongs and shackle bail. 36.22 grams total. Heavy, sturdy bezel, the coin with full shield and cross with orange sediment in crevices (AVF details). From the ca.-1629 "Panama Hoard."
Estimate: $250-375