Herennius Etruscus Caesar, Rome mint, 250-251 AD.,
Æ As (23-25 mm / 8.64 g),
Obv.: Q HER ETR MES DECIVS NOB C, bare-headed, draped bust of Herennius Etruscus right, seen from behind.
Rev.: PIETAS AVGG / S - C , Mercury standing left, holding purse and caduceus.
RIC IV 167b (Tr. Decius) ; C 13 .