Watch List notes:

MYSIA. Kyzikos. Circa 500-450 BC. Stater (Electrum, 20 mm, 16.06 g). Ram standing to left on a tunny fish. Rev. Quadripartite incuse square. BMFA 1467. Greenwell 130. SNG Paris 227. Von Fritze 91, and pl. III, 10. Well-centered and sharply struck. A few minor marks and scuffs, otherwise, about extremely fine.
From a European collection and those of J. P. Rosen and E.Ploil, Numismatica Ars Classica 92, 1, 223 May 2016, 187.