Constantine I. AE quarter follis, 307-337 AD. Trier. 

Obv: IMP CONSTANTINVS P F AVG, laureate, cuirassed bust right
Rev:  VOT/X/AVG/N in four lines within wreath. 

No mint mark.

RIC VI Trier 791, Rare.

With permission of Roma Numismatics, November, 2009