This one is fairly common, except it is fully silvered.
Constantine I
A.D. 318
19mm 3.0gm
IMP CONSTANT-INVS AG, high crested helmet, cuirassed, spear over right shoulder.
VICTORIAE LAETAE PRINC PERP, two Victories stg., facing one another, together holding shield inscribed VOT PR on altar.
In ex. PLN
RIC VII London 159