Aurelian, Serdica, silvered AE Antoninianus

IMP AURELIANVS AVG, Radiate, cuirassed bust right seen from
the back.
SOLI INVICTO, Sol standing left, treading down one of two 
captives, holding globe and raising right hand. 

Mintmark XXIS

RIC V-1, 308
RIC does not list any such coins so clearly seen from the back.

With permission of H. D. Rauch GmbH, Nov. 2009.