Syracuse, Sicily, AE15 hemilitra, 2.66 g. Time of Fourth Democracy, circa 289-287 BC. 

SWTEIRA, Head of Artemis left, quiver at shoulder.
SYRAK-OSIWN above and beneath winged thunderbolt. 

Sear 1208; CNS 147 corr.; SNG ANS 746; BMC 408.

With permission of Roma Numismatics E-Sale 20, Lot 112, Aug. 2015.
Estimate: £150.