This coin was in a group that I bought, though it is in rough condition it is pretty rare.
Constantine I
A.D. 307- 308
23x26mm 5.2gm
IMP C CONSTANTINVS P F AVG; laureate and draped bust right, seen from rear.
SECVRIT PERPET DD NN; Securitas stg. l.; leaning l. with transverse sceptre on column, r. raised to head.
In ex. PLC
RIC VI Lugdunum 278
there was also a Constantine as Caesar issue in the group
Constantine I
A.D. 307
23x24mm 5.2gm
CONSTANTINVS NOB CAES; laureate head right.
CONSERVATORES KART SVAE; Carthage standing facing, head left, holding fruits in both hands, within hexastyle temple with plain pediment.
In ex. PK∆
RIC VI Carthage 61