Reference
Note:
Obverse portrait is cuirassed but not draped (bust type F, not C)
Reference
Note:
Specimen is of Gallienus with a cuirassed bust (B1), not of Valerian with a draped and cuirassed bust (D1)
Reference
Note:
Specimen dated on basis of obverse inscription and bust type
Reference
OCRE : http://numismatics.org/ocre/id/ric.5.gall(1).401