Here is one of the earliest Republican coins, Crawford 17/1a, dated to 273-270 BC: 19-18 mm, 6.02 grams. Litra. Helmeted head of Minerva left ROMANO behind horse's head right Sear I 592 (line drawing only) Burnett CRW p. 5 suggests a mint of Cosa c. 255 BC. BMC ii p. 122 calls it a "half-litra." Crawford 17/1a. "Shortly before 269 BC" ex Don Hay collection. [$95+SOLD $4 shipping in the US] Please compare this price to prices elsewhere. For more ancient coins, see: http://augustuscoins.com/index.html