Watch List notes:

Sicily, Syracuse, Dionysios I (405-367), Tetradrachm, c. 405-400 BC; AV (g 1,16; mm 12; h 10); SYPA, head of Herakles l., wearing lion skin, Rv.S - Y - P - A, in quadripartite incuse square; in deeper circle incuse, small head of Arethusa l. Weber 1607; Rizzo Pl. XLVIII, n. 9; SNG ANS 351.
Scarce and lustrous, rusty obverse die, anyway about fdc.