Constantine I AE Follis. London. 

IMP CONSTAN-TINVS MAX AVG, helmeted, laureate, cuirassed
bust right.
VICTORIAE LAETAE PRINC PERP, Two Victories holding shield 
inscribed VOT /PR on altar type Helv. 1a (plain altar).
Mintmark PLN

RIC VII London 154, rated scarce.

Courtesy of TimeLine Originals (www.time-lines.co.uk), March, 2011