Watch List notes:

THRACE, Byzantion. Circa 387/6-340 BC. AR Tetradrachm (21mm, 15.21 g). Bull standing on dolphin left; Φ in wreath to left / Quadripartite incuse square with stippled surface. Schönert-Geiss, Byzantion 704–6 var. (unlisted dies); cf. SNG BM Black Sea 3–7; McClean 4236. Good VF, lightly toned, small scratch in field on obverse. Very rare with this control mark, only three specimens noted by Schönert-Geiss.