217-218 AD., Macrinus, Rome mint, Denarius, RIC 84.
Macrinus, Rome mint, 217-218 AD.,
Denarius (17-20 mm / 2.77 g),
Obv.: IMP C M OPEL SEV MACRINVS AVG , laureate cuirassed 
bust of Macrinus right, younger features with cropped beard.
Rev.: SALVS PVBLICA , Salus seated l., on chair with high back, holding patera, feeding serpent coiled round altar and placing her right hand on its head.

RIC 84; C. 114. 

With kind permission of armenius numismatics, March 2010.