Faustina II AR denarius, Rome, 3.6g. 

FAVSTINA AVGVSTA, draped bust right. 
MATRI MAGNAE, Cybele seated left, holding branch, 
lion sitting left at her side. 

Sear RCV 5259; RSC 172, RIC 706.

Courtesy of "trustedcoins" on ebay, June 2011.