Argos, Argolis, AR stater, 25 mm, 11.99 g. ca 370-350 BC. 

Head of Hera right, hair flowing down the back of her neck, 
wearing stephane ornamented with palmettes, earring and 
pearl necklace.
ARLEIWN, Two dolphins swimming left, Corinthian helmet right 
between E-M in the centre. 

BCD Peloponnesos (Leu) 1066 (this coin); Traité III, 617. 

Extremely rare, the second example known. 

With permission of cngcoins.com, Triton XV, January 2012