on wildwinds, lists it as Constantinople RIC 52b Valentinian II AE 22mm Follis. 375-392 AD. DN VALENTINIANVS PF AVG, diademed helmet, cuir.bust rightspear & shield / GLORIA RO-MANORVM, CON delta in ex., Valentinian II standing in galley, victory at helm. http://www.wildwinds.com/coins/ric/valentinian_II/t.html
I had it listed as 52b but now that I have access toRIC I find that it doesn't match. I can't find a listing tat does match