Magnesia, Ionia. AR diobol, (1.62g) c. 350 BC, 

Armed horseman prancing right, holding couched spear. 
NISAIOS above, MAGN below, Humped bull butting left. 

Type Sear Greece 4480

BMC 9; SNG von Aulock 2036, this coin.

With permission of cgb.fr, Mail bid sale 51, Nov. 2011