Postumus, AV aureus. AD 260-269. Cologne mint. 20mm, 5.75 g. 

POSTVMVS PIVS FELIX AVG, jugate busts left of Postumus, 
laureate and cuirassed, and Hercules, laureate. 
HERCVLI CRETENSI, Hercules wrestling the Cretan bull. 

RIC V-2 272; Pinder, Berlin 967 (this coin); Cohen 114 (this coin).