MODERN FAKE

Mamertini, Messana, Sicily, AE25 Pentonkion. 208-200 BC. 6.45 g.

Head of Zeus right, hair bound in a taenia, thunderbolt behind head.
MAMERTINWN, naked warrior, holding transverse spear and
shield on arm, in attacking post right. T in
left field, Pi in right field.

BMC 29; Hoover HGC 853. 

The main signs to recognise these fakes are
1) behind the head of "Zeus": the small y shape which is 
supposed to denote a thunderbolt.
2) The short hair of Zeus which should be longer at the
neck (see other examples of this series here on wildwinds).
3) the T behind the warrior which should be a TR monogram.
4) The shield has no "spokes".