Constantine I, AE follis, Lyons mint. AD 306-337. 24 mm, 6.68 g. 

IMP C CONSTANTINVS P F AVG, laureate, cuirassed bust right.
MARTI PATRI CONSERVATORI, Mars, naked but for helmet, standing right, holding spear and resting left hand on shield. 

N in left field. 
Mintmark PLG.

RIC VI, Lyons 240.

With permission of Savoca Online Auction 209 Silver, Lot 526, April 2024.