hola,es constantivs ll,reverso FEL TEMP REPARATIO,la ceca es constantinopla,te dejo un enlace,saludos.
http://www.wildwinds.com/coins/ric/constantius_II/_constantinople_RIC_viii_106.jpg
Constantinople
RIC VIII 106 Constantius II AE2. 351-355 AD. D N CONSTANTIVS P F AVG, diademed, draped & cuirassed bust right / FEL TEMP REPARATIO, soldier on right spearing a fallen horseman, in pointed hat & holding the neck of his horse with both arms, (gamma) (dot) \ CONSB in ex.