Valerian II as Caesar. 256-258 AD. Antoninianus, 3.65g (6h). Antioch, 256-8 AD. Obv: P LIC COR VALERIANVS CAES Radiate, draped, cuirassed bust right. Rx: PRINCIPI IVBENTVTIS (sic) Prince standing left holding wand and transverse spear. Reverse legend var. of Göbl 1597d (9 spec.), RIC 51, and Cohen 84 (citing Rollin, 2 Fr.). Apparently unpublished with the late-Latin spelling variant IVBENTVTIS in the reverse legend, instead of the usual IVVENTVTIS. Another specimen, but with the spelling variant overlooked, was in NAC 42, 20 Nov. 2007, Barry Feirstein Part III, lot 402 (different dies). EF
In late Latin the consonental letter V tended to be replaced by B: the earliest example on Roman coins may be an As of Caracalla in Vienna with reverse legend IVBENTAS IMPERII. Under Gallienus, the legend PRINCIPI IVBENTVTIS is also reported by Cohen 77-78 on another Eastern aureus and antoninianus type of Valerian II, but neither of these coins seems to be in Göbl; cf. his no. 1694b (attributed to Samosata)