Watch List notes:

MYSIA, Kyzikos. Circa 550-450 BC. EL Stater (16mm, 16.11 g). Head of boar left; to right, tunny upward / Quadripartite incuse square. Hurter & Liewald I 45a; CNG 114, lot 203; Roma XVII, lot 453; otherwise unpublished. Lightly toned. Good VF. Extremely rare, one of four known, the other in a public collection (State Pushkin Museum of Fine Arts, Moscow [cited by H&L]).

From the Jonathan P. Rosen Collection. Ex Triton XX (10 January 2017), lot 195.