Faustina I posthumous Sestertius. After 146 AD. Rome mint. 

Obv: DIVA FAVSTINA, draped bust right.
Rev: AETERNITAS, S-C across fields, Aeternitas standing 
left, holding phoenix on globe and raising hem of robe.

RIC 1105; Cohen 12; BMC 1490; Sear 1105.

With permission of TimeLine Auctions 
(www.timelineauctions.com), June, 2017