This coin has a small dot on the reverse after AVGG. It is very small, maybe something used in the engraving process, like a centering dot.
Constantine I
A.D. 325-6
18mm 3.3g
CONSTAN-TINVS AVG; laureate head right.
PROVIDEN-TIAE AVGG•; camp gate, two turrets, no doors, star above.
In ex. MNE
RIC VII Nicomedia 121
ex-Dattari