Watch List notes:

Marcus Aurelius. A.D. 161-180. AE dupondius (24.77 mm, 11.86 g, 6 h). Rome mint, A.D. 164. M AVREL ANTONINVS AVG ARMENIACVS [P M], radiate head right / [TR P] XVIII IMP II COS III, S-C, RIC 864. VF, dark green patina, flan crack. 

Ex Vatican Museum duplicate from St. John's College Collection, no. 493.