Greek Italy. Etruria, Cosa. AE 20 mm. (Quartuncia), 273-c. 250 BC. D/ Helmeted, bearded head of Mars right. R/ Head of bridled horse left on dolphin; around, CO[SANO]. HN Italy 210; Buttrey I; SNG Cop. 17. g. 5.97 mm. 20.00 RR. Very rare and in exceptional condition for issue. Lovely untouched glossy olive green patina. EF.