Constantine I AE Follis, 318 AD. 

Obv: IMP CONSTANTINVS PF AVG, laureate, draped & cuirassed bust right 
Rev: SOLI INV-I-CTO COMITI, Sol standing left, chlamys across left shoulder, 
 holding globe, right hand raised. Mintmark: P star in crescent A. 

RIC VII Arles 164, rated scarce

with kind permission of cgb.fr.