Buenas.
Constantine II AD 316-340
AE3 "I pledge ten years" Obv: CONSTANTINVS IVN NOB C - Laureate head
right Rev: CAESARVM NOSTRORVM- Wreath within is written VOT X Exe:
(gamma) SIS (eyelash) Siscia mint AD 321-324 = RIC VII, 182
http://www.wildwinds.com/coins/ric/constantine_II/t.html
Saludos.