Watch List notes:

WESTERN ASIA MINOR, Uncertain. 5th century BC. AR Trihemiobol (8mm, 0.88 g). Head of horse right / Quadripartite incuse square. Cf. Klein 332 (hemiobol; Kyme); CNG E-370, lot 138 (same dies). Toned, granular surfaces. Near VF.

See also Boston MFA 1835–6 for a didrachm attributed to Erythrai featuring a rider on horse, where the horse's head has the same composition as that found on this fraction. However, the attribution of the didrachms to Erythrai is uncertain.