Messene, Messenia, AE16 trichalkon. 180-150 BC. 2.83 g. 

Head of Demeter right, wreathed with corn.
ME monogram to right of bunch of grapes, DI above in wreath.

BMC 39-40. Grandjean 574a (this coin). 
Very rare. 

With permission of LHS Numismatik AG, May 2006. 
Auction 96, Lot 714