Constantine I. Trier. 

CONSTAN-TINVS AVG, helmeted, cuirassed bust right. 
VICTORIAE LAET PP, two Victories holding shield 
inscribed VOT PR over altar. Altar type Helv. 5a (star 
within a frame). 

Mintmark: STR. 

RIC VII Trier 229 var (unlisted officina). Very rare.

Courtesy of GB Collection (www.gb-collection.com), France
May 2010.