Constantine I AE Follis. Trier. 

IMP CONSTAN-TINVS MAX AVG, helmeted, laureate, cuirassed bust right
VICTORIAE LAETAE PRINC PERP, two Victories holding shield 
inscribed VOT PR over altar. Altar type Helvetica 4b (plain 
altar)

Mintmark STR.

RIC VII 213, rated C2 (common)

Sold on ebay in March 2010 by French seller Philippe Lacoste.