Aegina, Attica. Triobol. 2.21 gr, 14.02mm. Period III, 456-431 BC. 

Obv: Land tortoise seen from above. 
Rev: Incuse square of skew pattern forming five sections; two dots in one section.

Babelon Traite 2, iii, 122; BMC 171; cf Sear Greece 1850 (no dots). 

With exclusive permission of TimeLine Auctions (www.timelineauctions.com), Jul, 2014