Stymphalos, Arkadia, AR obol. ca 350 BC. 12 mm, 0.95 g. 

Head of youthful Herakles right wearing lionskin headdress.
STYMFALION retrograde, head and neck of a waterbird right. 

BMC 2; BCD Pelop. I, 1703; SNG Cop 286. 

With permission of Roma Numismatics, March 2014.
Estimate: £5000.