Watch List notes:

Thrace, Byzantion AR Tetradrachm. Circa 387/6-340 BC. Bull standing on dolphin to left; Φ in wreath to left / Quadripartite incuse square with stippled surface. Schönert-Geiss, Byzantion 704-6 var. (these dies not listed); cf. SNG BM Black Sea 3-7; McClean 4236. 15.22g, 21mm.

Near Extremely Fine; unobtrusive scratch on obv. field. Very rare control mark - only three specimens noted by Schönert-Geiss.

From the Thrax Collection;
Ex Classical Numismatic Group Inc., Auction 100, October 2015, lot 1301.