Constantine I AE3. 

Obv: CONSTANTI-NVS MAX AVG, rosette-diademed, draped, cuirassed bust right 
Rev: GLOR-IA EXERC-ITVS, two soldiers holding spears and shields with two 
 standards between them. 
Mintmark: PCONST; top centre: laurel wreath with dot in its centre. 

RIC VII Arles 375, rated R3

Contributed by Dane for George Clegg (biggyg2), August, 2006.