Constantine I ‘The Great’ (307-337), AE follis, issued 309-310. Lugdunum, 4.68g, 23mm.
Obv: IMP CONSTANTINVS P F AVG, laureate, draped, and cuirassed, from the back
Rev: SOLI INVICTO COMITI, Sol standing left, chlamys falling from left shoulder, holding globe and raising right hand; F-T, PLG in ex.
RIC 310.
From the Caesar_Augustus collection.
A superb example with a wonderful dark green patina, much better than the photo indicates.