Valerian, AE25 of Prusa ad Olympum, Bithynia. Pythian-Olympian Games issue. AD 256-258. 8.35 g. 

POY L OYALERIANOC CEB, radiate, draped and cuirassed bust right.
PROYCAEWN OLYMPIA PYQIA, two prize urns, each containing palm branch, five balls in upper right field. 

RecGen 183; Waddington 524. 

With permission of Numismatik Naumann auction 94, lot 300, Oct. 2020.