Aegina. AR stater, ca 457-431 BC. 12.25 g. 

Land tortoise with segmented shell.
5-part Skew pattern. 

Milbank, Plate II, 10; Dewing 1685; SNG Delepierre 1774; BMC pl. 24, 11. 

With permission of Gorny & Mosch auction 170, Lot 1376, Sept. 2008.