Valerian II Caesar (253-255).     AR Antoninianus. Colonia Agrippinensis (Cologne) mint. 1st emission of Valerian I, AD 257-258.   Obv.    VALERIANVS CAES. Radiate and draped bust right.        Rev.   IOVI CRESCENTI. Young Jupiter seated facing, head left, raising hand, riding goat right.     RIC V 3.     3.27 g.   21.50 mm.      Scarce.    About EF/EF.