Watch List notes:

MYSIA. Kyzikos. Circa 500-450 BC. Stater (Electrum, 20 mm, 15.90 g). Kerberos with two heads, each with a collar, and with his tail terminating in the head of a serpent, standing on a tunny to left. Rev. Quadripartite incuse square. BMFA 1538. Greenwell 141. Cf. SNG Paris 244 (hekte). Von Fritze 103 and pl. III, 22. A few light marks and scratches, otherwise, about extremely fine.
From a European collection acquired prior to 2020.