Image rights: wildwinds.com

Herennia Etruscilla AD 249-251 AR Antoninianus.
 
HER ETRVSCILLA AVG - Diademed bust right, draped and on a 
crescent. 
FECVNDITAS AVG - Fecunditas standing left, holding 
hand over child and cornucopia. Rome mint: AD 250-251 

RIC IV-3, 55b; RSC 8