Watch List notes:

The Robert P Ball Cabinet of Ancient Coins | Lucania, Poseidonia, AR Nomos or Stater, c. 420-400 BC, POSEIDA, Poseidon standing right, throwing trident, bearded and nude but with arms draped, O behind, rev. [P]OMESDAI in retrograde, bull standing left on dotted exergual line, 7.72g, 6h (SNG ANS 679; Kraay & Hirmer, 221 same dies; de Luynes, 531 same dies; Jameson 335; Locker Lampson 26; Weber 817 same dies), a marvellous depiction of Poseidon on a richly toned and chunky elliptical flan, a pleasingly good very fine, extremely rare, a superb example.
Provenance
Bank Leu 83, by private treaty, 1985 - CHF8,338
Estimate: $6000 - $10000