Mantinea, Arkadia, AR triobol. ca 490-480 BC. 2.91 g. 

Bear walking left on dotted groundline, countermark of star on shoulder.
M-A, incuse square consisting of two rectangles separated 
by a bar, each with a small deep incuse at opposite ends. 

BMC 1; Traité I 1236.
Very rare. 

With permission of Leu Numismatik, May 2006.