This coin is not listed in RIC with a P in the obverse legend; but it should come before RIC 79. It is listed in Bastien as #17, with 2 examples cited.
Constantine I
A.D. 320
19mm 2.7gm
CONSTANTINVS P AVG high crested helmet (bowl shaped), cuirassed
VICTORIAE LAET PRINC PERP, two Victories stg., facing one another, together holding shield inscribed VOT PR [VOTA POPULI ROMANI (vows of the Roman people)]on altar.
in ex. P [2 captives] L
cf RIC VII Lyons 79
