Amphipolis, Macedonia, AE19. 6,58 g. 

Obv: Head of bearded Poseidon, wearing tiana.
Rev: AMFIPOLEITWN, horse stepping right.
No monograms.

AMNG III, 2, 35, cf 39/40 (with monograms); cf SNG Cop. 64ff. 

J.P. Righetti sale, Part IV, October 2004, lot 220
Courtesy of Münzen & Medaillen.
Estimate: EUR 50.-