Caracalla AE dupondius, AD 198-217. 24 mm, 9.g. Struck AD 213. 

ANTONINVS PIVS AVG BRIT, radiate head right.
P M TR P X-VI-C-OS IIII PP S-C. Serapis, standing left, 
Holding sceptre and raising right hand. 

RIC 502; Cohen 215.

Rare.
Münzen und Medaillen Basel auction 1972.
From the AK collection.