Watch List notes:

MYSIA, Kyzikos. Circa 450-330 BC. EL Stater (17mm, 15.99 g). Horned and bearded head of Zeus Ammon facing slightly left / Quadripartite incuse square. Von Fritze I 183; Greenwell –; Boston MFA 1559 = Warren 1425 = Traité II 2624, pl. 173, 32; SNG BN –; SNG von Aulock –; BMC –; FSD –; Gillet –; Gulbenkian –; Jameson –; Myrmekion 100 (same die and punch); Rosen –; Weber –; Sotheby, 8 July 1996, lot 60 = Leu 59, lot 125. Good VF. Exceptional for this extremely rare issue, apparently the fourth known.