Watch List notes:

MYSIA, Kyzikos. Circa 550-450 BC. EL Stater (14.5mm, 15.85 g). Head of ephebos left on diskos; below, tunny left / Quadripartite incuse square. Von Fritze I 105; Greenwell 77; cf. Boston MFA 1476 = Warren 1496 (hekte); SNG BN 248; BMC 21; Gulbenkian –; Jameson 2566. Toned, small banker's mark on obverse. Good Fine. Extremely rare as a stater, one of only three in CoinArchives.

From the Jonathan P. Rosen Collection. Ex Roma XIV (21 September 2017), lot 215.