Watch List notes:

Bithynia, Kalchedon AR Drachm. Circa 367-340 BC. Rhodian standard. KAΛX Bull standing left on grain ear; to left, kerykeion and monogram / Quadripartite incuse square. Unpublished in the standard references with this monogram, for type cf. SNG Black Sea 103-6. 3.81g, 14mm.

Good Very Fine. An apparently unrecorded monogram.

From a private UK collection.