Silver antoninianus, 23mm, 2.69gm, issued AD 257/258 Cologne mint.
Obv: VALERIANVS CAES, Radiate, draped bust right.
Rev: IOVI CRESCENTI, Infant Jupiter on goat.
References: Sear 10731, RIC 3.
A similar reverse was used by Vespasian on Domitian's coinage - presumably the type indicates the young Caesar hopeful ascendency to Emperor, just as Jupiter grew to become King of the Gods. References the Amalthean goat raising Jupiter when he was an infant in Crete. The young Valerian II died, however, soon after taking command in Illyria.