Boeotia, AE17, federal issue. ca 220 BC. 3.37 g. 

Head of Demeter or Kore, wreathed with corn, facing slightly right.
BOIWTWN, Poseidon, naked, standing left, resting right foot on rock and leaning on trident. 

BMC 81; BCD Boiotia 102 (this coin); SNG Cop 384.

With permission of cngcoins.com, auction 160, Lot 24, March 2007.
Ex BCD Collection (Triton IX, 10 January 2006), lot 102.