Watch List notes:

Italy. Coastal Etruria, Cosa. AE Quartuncia, c. 273-250 BC. Obv. Bearded head of Mars right, wearing crested Corinthian helmet. Traces of ethnic. Rev. Bridled horse's head right. Traces of ethnic. HN Italy 210. cf. SNG ANS 75. AE. g. 5.25 mm. 18.00 RR. Irregular flan. About VF. Very rare, green patina.