there is nothing special about this coin except, that at 4.2gm, it weighs about a gram more than average. The flan is pretty thick and it is a fairly chunky coin.
Constantine I
A.D. 328
19x22mm 4.2gm
CONSTAN-TINVS AVG; pearl-diademed head right.
VIRTV-S AVGG; gateway with wide open doors, four turrets, star above. S/F in fields.
in ex. PCONST
RIC VII Arles 321