Valentinian III. AE4. Rome. AD 425-435. 13mm, 1.44 g. 

D N VALENTINIANVS P F AVG, pearl-diademed, draped and 
cuirassed bust right.
VOT PVB, camp-gate with no doors and two turrets.

P above.
Mintmark (RPM). 

RIC X 2123; LRBC 858. 

With permission of cngcoins.com, Dec 2012.
Estimate: $100.