Postumus - Serapi

Postumus - Gallic Empire (Romano-Gallic); 259 - 268 A.D.; Silver Antoninianus. Ob: IMP.C.POSTVMVS P.F.AVG.; Radiate bust draped and cuirassed r.
Rx: SERAPI COMIT AVG. (sometimes SARAPI or SARAPIDI); Serapis standing left holding sceptre and raising right hand, in lower background a vessel (I don't see it). VF+. RSC 358; R.I.C. 329; 4.09 gm.
For a brief History of the Gallic Empire in the Moneta Library:
VIEW & DOWNLOAD: Gallic Empire by Percy Webb at this: Gallic Empire