This coin came out of a group of uncleaned, it has some porosity and the reverse is weakly struck; but it does have the Aegis on the shield.
Crispus
A.D. 322- 323
19x21mm 2.6gm
IVL CRISPVS NOB CAES, laureate cuirassed bust left, spear across right shoulder, shield inscribed with medusa on left arm.
BEATA TRAN-QVILLITAS, Globe set on altar insc. VO/TIS/XX; above three stars.
In exergue dot STR dot
RIC VII Trier 372