Prusias II, king of Bithynia. AR tetradrachm. 183-149 BC. 16.86 g. 

Diademed head of Prusias right. (Diadem is winged)
BASILEWS PROYSIOY, Zeus standing left, holding wreath and sceptre. Eagle on thunderbolt in left field.

IPMH in lower left field.

SNG von Aulock 251 (this coin); Kaye 105 (this coin). Monogram not in RecGen. 

With permission of Numismatica Ars Classica auction 106, Lot 251, May 2018
Ex Bank Leu sale 50, loz 147 (1990).