This coin has a clear dot beside the T over star in the left field on the reverse, but there are no coins listed in RIC for this series with a dot. Possibly only an engravers error, but worth noting.
I also checked Ferrando's L’atelier monétaire d’Arles. De Constantin le Grand à Romulus Augustule, 313-476, but there was nothing like it listed.
Constantine I
A.D. 316
19mm 3.9gm
IMP CONSTANTINVS PF AVG, Laureate, draped and cuirassed bust right
SOLI INVICTO COMITI, Sol standing holding globe.
In ex. PARL, dot T/* left, F right
Cf. RIC VII Arles 84