Julian II, AV Solidus. Rome. AD 361-363. 

DN CL IVL-IANVS NC, bare-headed, cuirassed bust right.
FEL TEMP REPARATIO, Constantinopolis and Roma seated, holding 
between them a shield inscribed with a star.

Mintmark RSMS star. 

RIC VIII Rome 289 var (this mintmark not in RIC for Julian III).