Marcus Aurelius Denarius. 

Obv: M ANTONINVS AVG TR P XXVI, Laureate, cuirassed bust right

Rev: IMP VI COS III, Roma seated left, holding Victory and spear, large shield at side

Minted in Rome. A.D. 172

Reference: BM 557 note. RIC 259 var (not listed with this but type). RSC 280 var.

This coin is not listed in RIC or RSC with this bust type. 
This denarius seems to be meant by an odd
description in BM 557 note: "laureate, with cuirass on r. shoulder, 
note in B.M."

Contributed by Martin Griffiths, April, 2005.