Seleucus II Callinicus. AR Tetradrachm Uncertain 37, in Mesopotamia west of Nisibis. Diademed head right / Apollo standing left, examining arrow & resting elbow on tall tripod, <font face="SYMBOL">DI</font> monogram in outer left, H-over-<font face="SYMBOL">D</font>-over-P monogram in outer right field.