Watch List notes:

Megaris, Megara. 4th-3rd centuries B.C. AE dichalkon (15.5 mm, 2.56 g, 7 h). Prow of galley left on which stands a tripod; trident above / MEΓ, two dolphins swimming in opposite directions. BCD Peloponnesos 11; SNG Copenhagen 480; BMC 22. VF/F. 

Ex BCD collection with his round tag.