Watch List notes:

WORLD COINS. Bolivia. Philip II (1556-1598), Silver Cob 8-Reales, Potosi, undated, Assayer S for Pedro Sanchez or Cristobal da Segovia, 27.48g (Cal 163, this coin).Softly struck, about very fine and the only known specimen, extremely rare thus.

Estimate: £4000-5000