Cosa, Etruria, AE20. ca. 273-250 BC, 5.10 g. 

Helmeted head of Athena or Coza right (sometimes with COZA retrograde in right field).
CO–ZA–N–O, bridled head of horse left.

Sambon 149; HN Italy 211; cf SNG Cop 17 (Mars).

Extremely rare.

With permission of Numismatica Ars Classica auction 40, Lot 205, May 2007