Watch List notes:

Ionia, Erythrai AR Obol. Circa 500-480 BC. Rider (Erythros?) on horseback galloping to right / Quadripartite incuse square. SNG Copenhagen 554 var. (didrachm); SNG von Aulock 1943 var. (same); Jameson 2269 var. (same); Boston MFA 1834 var. (diobol); Rosen 574-5 var. (same); Traité II -; Naumann 83, 275; CNG e281, 105. 0.60g, 9mm.

Very Fine. Extremely Rare; unpublished in the standard references and seemingly only two other examples on CoinArchives.

From the inventory of a UK dealer.