Watch List notes:

MYSIA, Kyzikos. Circa 550-450 BC. EL Stater (19mm, 16.08 g). Head of Acheloös left; to right, tunny upward / Quadripartite incuse square. Hurter & Liewald I 11a = Gulbenkian 607; otherwise, unpublished. Lightly toned, double struck. VF. Extremely rare, only three in CoinArchives (Roma XX, lot 209; Roma XVII, lot 469; and Berk BBS 191, lot 1).

From the Siren Collection.