Silver antoninianus, 20mm, 3.16gm, issued AD 265-268 Cologne mint.
Obv: IMP C POSTVMVS PF AVG, Radiate, draped and cuirassed bust facing right.
Rev: SERAPI COMITI AVG, Serapis standing raising hand and holding sceptre.
References: Sear 10992, RIC 329, RSC 360a.
