Watch List notes:

The Robert P Ball Cabinet of Ancient Coins | Cyclades, Thera, AR Stater, c. 525/520-500 BC, two dolphins left and right, rev. irregular 'union jack' quadripartite incuse square (Montagu 462; Benson 626; Traité pl. LXII, 17; Boutin 23; Rosen 243; Sheedy 16a) slightly off-struck on obverse and lightly toned, strictly bolder than fine, but very rare.
Provenance
Bank Leu, by private treaty, 1970 - CHF2,600
Estimate: $3000 - $4000