Bronze AE3, 19mm, 3.15gm, issued AD 363/364 Heraclea mint.
Obv: DN IOVIANVS PF AVG, Diademed, draped, cuirassed bust left.
Rev: VOT V MVLT X (HERACB in ex.), Vows within a wreath.
References: Sear 19231, RIC 110.