Corinth, AR trihemiobol, ca 450-400 BC. 11mm, 0.68g. 

Pegasos flying left, with curved wing, koppa below. 
T-P-I-H around head of gorgoneion facing. 

BMC 109-110. 

Rare. 

With permission of Nomos AG - obolos 11, Lot 203, Dec. 2018.