Watch List notes:

THRACE, Byzantion. Circa 240-220 BC. AR Tetradrachm (26mm, 12.46 g, 12h). Athanaion, magistrate. Wreathed and veiled head of Demeter right / Poseidon seated right on rocks, holding trident and aphlaston; monogram to left, civic monogram to right; EΠI AΘANAIΩN[OΣ] in exergue. Marinescu Issue 11; Schönert-Geiss, Byzantion 1002 (V13/R20); HGC 3, 1408. Fine, lightly toned, smoothed.