Constantius II AD 337-361, AE Centenionalis (22mm, 5.04 gram) Siscia AD 351 DN CONSTANTIVS PF AVG; Dr., cuir. bust with pearl diadem r., A behind CONCORDIA MILITVM; in ex, ESIS-crescent; Emperor in military dress, stg.facing, head l., holding in each hand a standard with Chi-Rho in the banner, over his head, a star; in l.field, III RIC 301; 5.09g; 22mm; EF
Look at the ear on the obverse. It's the highest relief part of the coin. Any wear would have occurred there first. If you see an ear worn flat but lots of hair detail and strong, distinct letters, then you might suspect tooling. On your coin the ear shows almost no wear, so I would assume that all the other details are original, not the result of tooling. I think it's a beautiful coin.