Seleukos I Nikator, Seleukid kingdom. 312-281 BC. AR Tetradrachm, Pergamon mint, 281 BC. 16.80 g.

Bridled head of horned horse with open mouth right. 
BASILEWS SELEYKOY, elephant walking right, star above, anchor below. 

Houghton SC I, 1.2; Newell WSM 1529; Babelon Rois 55 (this coin); de Luynes 3265.

Courtesy of the Bibliotheque Nationale, Paris, gallica.bnf.fr.