Mantinea, Arkadia, AR Tritetartemorion. ca 420-386 BC. 0.7 g. 

MAN (anticlockwise), three acorns arranged in a triangle, outwards.
TTT (value mark) Arranged with their bases inwards.

BMC 12; Traité 961.
Extremely rare.

With permission of LHS Numismatik AG, auction 96, Lot 1473, May 2006.