Watch List notes:

MYSIA, Kyzikos. Circa 550-450 BC. EL Stater (19.5mm, 16.08 g). Head of Perseus left, wearing winged helmet; to right, tunny downward / Quadripartite incuse square. Von Fritze I 65; Greenwell 73; Boston MFA 1449 = Warren 1490; SNG BN 193; Kraay & Hirmer 698; Weber 4973. Toned, a couple of tiny flan flaws. VF. Very rare, only five in CoinArchives.

From the Jonathan P. Rosen Collection.