Silver denarius, 19mm, 3.43gm, issued AD 198/199 Rome mint.
Obv: IMP CAES M AVR ANTON AVG, Bare-headed, draped, cuirassed bust right.
Rev: SECVRIT ORBIS, Securitas, draped, seated right on low seat, propping head and holding sceptre; to side, altar.
References: Sear 6885, RIC 22b, RSC 571.