Seleukos I Nikator, 312-280 BC. Sardis mint, AE half-unit. 14mm.

Obv: Winged head of Medusa right with serpents in hair.
Rev: BASILEWS SELEUKOU above and beneath bull butting right; 
SI between hind legs.

Houghton SC 6.1; Newell, WSM, 1357; SNG Spaer, 67; BMC 65.

Used with permission of CNG coins, www.cngcoins.com, June, 2002