Prusias II, king of Bithynia. AE20. 183-149 BC. 5.72 g. 

Head of Hermes right, wearing petatos.
BASILEWS PROYSIOY, lyre (chelys) with decorated resonator. 

R IY MH monogram and RTS monogram below.

RecGen 21.2; SNG Ashmolean 447-448; Hoover HGC 628. 

With permission of Numismatik Naumann auction 65, Lot 112, May 2018.