Valentinian I, AE3, Siscia. DN VALENTINI-ANVS PF AVG, pearl diademed, draped, cuirassed bust right / GLORIA RO-MANORVM, Emperor in military dress, walking right, head left, holding labarum, dragging captive behind him. No fieldmarks. Mintmark: dot ΓSISC. RIC IX Siscia 5a, type ii.
VALENTINIAN I AE3 OBVERSE: D N VALENTINI-ANVS P F AVG, diademed, draped & cuirassed bust right REVERSE: GLORIA RO-MANORVM, emperor walking right, head turned back, grasping bound captive at the top of the head & holding labarum, D in right field, Mintmark TRP star. RIC IX Trier 5a type iii(a). Struck at Trier 367-375 AD 2.7g, 18mm Trier RIC 5a
On mine below I'm not 100% certain about the exergue. I think the letter following the 'dot' is an 'A', and I think there really was an intentional 'I' between the S's.
A coin to watch for an opportunity to acquire is the large AE1 issued at the beginning of the reign. The size had been common under Julian II using the famous bull reverse. Valentinian's version RESTITVTOR REPVBLICAE shows the emperor standing. This one is Heraclea mint SMHB. These are less common than Julian's bulls but the relatively boring type results in lower demand.
Interesting. When you look at the A's in the obverse in inscription, it looks very different. But it looks very similar to the A's in the reverse inscription. This makes me suspect that the two inscriptions were carved by different celators.
There is also a similar AEIII issue, also from the beginning of his reign: (Bronze) AE III Constantinople mint, A.D. 364-367 Obv: D N VALENTINI-ANVS P F AVG Rev: RESTITV-TOR REIP - Emperor, standing right, with laborum and holding Victory on globe CONSPΔ in exergue RIC 20(a) 19mm, 3.0g.
Valentinian I struck between 367-375 in Siscia BSISCV A.D. Obv. D.N.VALENTINI-ANVS.P.F.AVG. Rev. GLORIA.ROMANORVM. Emperor advancing r., with r. hand dragging captive & holding labarum in l. numerous symbols in r field.