Constantine II AE3. 

Obv: CONSTANTINVS IVN NOB C, laureate, cuirassed bust right 
Rev: GLOR-IA EXERC-ITVS, two soldiers holding spears and shields 
with two standards between them with O on banners.
Mintmark: dot in crescent PLG

RIC VII Lyons 254, rated R1

With permission of Roma Numismatics, April, 2011