Watch List notes:

Marcus Aurelius. A.D. 161-180. AR denarius (17.31 mm, 3.55 g, 12 h). Rome mint, struck A.D. 169. M ANTONINVS AVG TR P XXIII, laureate head right / SALVTI AVG COS III, Salus standing left, holding patera in right hand and feeding snake rising from garlanded altar and holding scepter in left. RIC 207 var.; RSC 543 var.. aEF/VF. 

From the Porter Collection.