Watch List notes:

Bithynia, Kalchedon AR Tetradrachm. In the name and types of Alexander III of Macedon. Circa 311-301 BC, c/m: circa 240-220 BC. Head of Herakles right, wearing lion skin headdress; c/m: laureate head of Apollo right, K before; AΠ monogram behind; corn ear below / [ΒΑΣΙ]Λ[ΕΩΣ], Zeus Aëtophoros seated left, holding sceptre. Stancomb 2007, pp. 25-32, 8 (this coin); cf. Büyükçekmece, 'Head cmk, II' var. 15.74g, 29mm, 8h.

Fine.

From the William Stancomb Collection;
This coin published in William Stancomb, 'Some Countermarked and Overstruck Hellenistic Coins from the Region of the Thracian Bosporos (NC 167, 2007);
Acquired from Beirne, 2000.