This coin is in really good style, but the bust is not quite right. The chin is smaller than usual with a longer neck and the cuirass looks just odd.
Crispus
A.D. 321
18x19mm 3.2gm
IVL CRISPVS NOB CAES, laureate, cuirassed, spear pointing forward, shield on left arm
BEATA TRAN-QVILLITAS, Globe set on altar insc. VOT/IS/XX; above three stars.
In exergue dot STR dot
Cf. RIC VII Trier 308