I just recently got this one.
Constantine I
A.D. 305-307
28mm 9.9g
FL VAL CONSTANTINVS NOB C; laureate, draped and cuirassed bust right, seen from rear.
GENIO POPVLI ROMANI; Genius standing left, head towered, loins draped, right holding patera, left cornucopiae; S-F across fields.
In ex. PTR
RIC VI Trier 669b