Roman Imperial
Herennius Etruscus, Caesar (249-251 AD). Rome
AR Antoninianus (21mm 2.62g)
Obv: Q HER ETR MES DECIVS NOB C, radiate and draped bust to right
Rev: PIETAS AVGG, Mercury standing to left, holding purse and caduceus.
RIC IV 142b (Decius); RSC 11.