Greek ISLANDS off ATTICA, Aegina. Circa 370-350 BC. AE12, 1.94 g. 

A between two dolphins swimming upward.
Incuse square of skew pattern. 

Agora 662; SNG Cop 533; Hoover HGC 461; BMC 206ff; Laffaille 359. 

With permission of cngcoins.com, auction 265, Lot 134, Oct. 2011.