Banker's mark on the reverse.
Greece
Persia, Achaemenid Kings, Xerxes II (424 BC) or Artaxerxes II (408-358 BC), Siglos ca 420-350 BC, Sardes mint
Obverse: persian king wearing kidaris and kandys and with quiver over shoulder, in kneeling-running stance to right, holding dagger and strung bow
Reverse: incuse punch
Diameter 16 mm, weight 5.31 g