Constantine the Great AE3. 

Obv: F L VAL CONSTANTINVS NOB C, laureate cuirassed bust right 
Rev: MARTI PAT-RI PROPVG, Mars, helmeted, advancing right, holding transverse 
 spear in right hand and shield on left arm. 
Mintmark: PTR, S-A across fields. 

RIC VI, Trier 741


Contributed by Dane for George Clegg, August, 2005.