Constantine I, AE Follis. 313 AD. Trier. 18 mm, 3.23 g.

Obv: IMP CONSTANTI-NVS AVG, cuirassed bust left, wearing high-
crested helmet, spear over right shoulder
Rev: VICTORIAE LAETAE PRINC PERP, 2 Victories standing facing 
each other holding shield inscribed VOT PR on altar with square 
design of 3-D appearance (Helv. 8a).

Mintmark PTR. 

RIC VII Trier RIC 208A; Cohen 643.