Constantine I. AE follis of Siscia.

IMP CONSTANTINVS PF AVG, laureate, draped and cuirassed bust right.
SOLI INVI-CTO COMITI, Sol standing left, chlamys across left 
shoulder, holding globe, right hand raised. 

Star in left field.
Mintmark: Gamma SIS. 

RIC VII Siscia 31

With permission of Numismatik Lanz, auction 102, 2001.