Faustina I AE As AD 138-141. 28 mm, struck AD 139.

FAVSTINA AVG ANTONINI AVG PII P P, draped bust right.
CERES S-C, Ceres standing left, holding corn ears and long torch. 

RIC III, 1084; Cohen 140; Sear 4679. 

Image courtesy of the Münzkabinett der Universität Göttingen, inv. no. 185741.