Constantine I AE Quarter Follis. 310-311 AD. Trier. 

CONSTANTINVS PF AVG, laureate, draped bust right
VOT X MVL XX (sic)in four lines within wreath. 

No mintmark. 

RIC VI Trier 913 var, rated R3. 
Bust type unlisted in RIC. 
Another was sold in the Fritz Rudolf Künker auction, 
October 2001

With permission of Roma Numismatics, August, 2009