I have only ever seen a few coins like this-- the soldier has a spiral design on his shield.
Constantius II
A.D. 350- 355
24mm 4.7gm
D N CONSTANTIVS P F AVG, pearl diademed, draped & cuirassed bust right.
FEL TEMP RE-PARATIO Soldier spearing fallen horseman, ✶ in left field.
In ex. ANA
RIC VIII Antioch 122