Marcus Aurelius (161-180). AR Denarius, 166 AD. D/ M ANTONINVS AVG ARM PARTH MAX. Laureate head right. R/ PAX / TR P XX IMP IIII COS III. Pax standing left, holding branch and cornucopiae. RIC 159 corr. (Pax seated, in error). AR. g. 19.50 mm. 19.50 3,39. Great metal. Lustrous and virtually as struck. Exceptional. About FDC.