Watch List notes:

Marcus Aurelius (161-180), Denarius, Rome, AD 170; AR (g 3,54; mm 17; h 6); M ANTONINVS AVG TR P XXIIII, laureate head r., Rv. SALVTI AVG COS III, Salus standing l., holding sceptre and feeding out from patera snake coiled around altar. RIC 222; C 546.
Iridescent tone, about fdc.