Cosa, Etruria. ca 273-250 BC. AE Quartuncia (5.08 g). 

Bearded head of Mars right, wearing crested Corinthian helmet.
COZANO, bridled head of a horse left, resting on a dolphin swimming left.

Buttrey, "The mint of Cosa," in Memoirs of the American Academy in Rome 34, 1980, Type I, 5-8; BMC 3 var. (horse head right); SNG Cop 17. 

Rare. 
Triton V Sale, 15 Jan 2002, lot 3.
 
 Lot sold for USD 600.

Used by permission of CNG, www.historicalcoins.com