This bust type (F) is not listed in RIC for this series- it should be after RIC VI Londonium 265.
Constantine I
A.D. 312- 313
IMP CONSTANTINVS P F AVG, helmeted and cuirassed bust facing left with spear over right shoulder and shield on left arm.
PRINCIPI IVVENTVTIS, Prince standing facing in military garb, standard in each hand.
n ex. PLN, star in left field.