Constantine I, AE follis, Rome. 

CONSTANTINVS AVG, laureate, draped and cuirassed bust right.
DN CONSTANTINI MAX AVG around VOT XX within wreath. 

Mintmark RQ.

RIC VII Rome 237 var (bust type); Bikic-Do hoard, Sirmium VIII 253 var (mintmark RP); NotinRic 7rom-237-q.

Contributed by Richard Demarco of Carpe Diem 
Numismatics, Oct. 2020.