Mamertini, Messana, Sicily, AE pentonkion. 220-200 BC. 4.16 g. 

DIOS, Laureate head of Zeus right, TR monogram (sometimes 
also with XAHR monogram) behind head.
MAMERTINWN, Hermes standing left, holding branch and 
caduceus, ram running left at foot left.

BMC 47; SNG ANS 437; Hoover HGC 856; Särström 283–290.