Silver denarius, 18mm, 2.87gm, issued AD 210 Rome mint.
Obv: SEVERVS PIVS AVG, Laureate head right.
Rev: PM TRP XVIII COS III PP, Salus, draped, seated left, feeding out of patera in right hand snake coiled in lap.
References: Sear 6348, RIC 236, RSC 548.
