Philip II and Serapis AE 26 of Mesembria, Moesia Inferior. 26x27 
  mm, 13.3 g. Choice surfaces with superb, glossy dark green patina. 
  Great detail with choice portrait of Serapis. OBVERSE: Philip II and 
  Serapis facing. REVERSE: Ares standing left, holding shield and 
  reversed spear.

Courtesy of Gerhard Rhode Coins