Valentinian I AE3. 

Constantinople - RIC IX 29a - 364-375AD
 
Obv: DN VALENTINIANVS PF AVG
Diademed, draped and cuirassed bust right
Rev: SECVRITAS REIPVBLICAE
Victory advancing left holding wreath and palm branch
Exe: CONSPA
rates scarce
 
Contributed by Peter Maguire, April, 2004.