Watch List notes:

The M.L. Collection of Coins of Magna Graecia and Sicily
Syracuse

Didrachm circa 480, AR 8.23 g. Horseman r. Rev. ΣVRA – KOΣ – ΙΟN Pearl-diademed head of Arethusa r; around, three dolphins swimming clockwise. Rizzo pl. XXXIV, 23 (these dies). Boston 343 (these dies). Dewing 99 (this obverse die). Boheringer 98.
Very rare. Of superb archaic style, old cabinet tone and good very fine
From the Charles Gilett collection.