Constantine I AE Follis, Trier mint, 307 AD.

FL VAL CONSTANTINVS NOB C, Laureate, cuirassed bust right.
MARTI PATRI CONSERVATORI, Mars standing right, holding 
reversed spear and leaning on shield.

S-A across fields.
Mintmark PTR.
RIC VI Trier 725.

With permission of Roma Numismatics, Sept. 2012.