Coin depicted roughly twice actual size*

Antoninianus of Herennius Etruscus

Silver antoninianus, 22mm, 4.45gm, issued AD 250/251 Rome mint.

Obv: Q HER ETR MES DECIVS NOB C, Radiate, draped bust right.

Rev: PIETAS AVGVSTORVM, Sprinkler, simpulum, jug, and lituus.

References: Sear 9521, RIC 143, RSC 14.