Celtic Britain. Durotriges. Circa 65 BC - 45 AD. AR Stater (20mm - 4.98 g). Cranborne Chase type. 

Stylized head of Apollo right.
Disjointed horse left; pellets above, dot below, dot in lozenge above tail, zigzag and dot pattern between two parallel exergue lines. 

Van Arsdell 1235-1; SCBC 366. 

Ex Isle of Wight Hoard.