Constantine II as caesar (317-337), follis (Bronze, 20.0 mm, 2.54 g), London, struck under Constantine I, AD 321.
Obv: CONSTANT - INVS IVN N C, radiate, draped and cuirassed bust of Constantine II left, seen from behind.
Rev: BEATA TRAN***QVILLITAS, globe atop altar inscribed VOT/IS/XX in three lines, F - B in fields, PLON below.
Ref: RIC 216 (c3).