Gratian AE3, Thessalonica. AD 337-361. 

DN GRATIANVS PF AVG, pearl-diademed, draped, cuirassed bust right.
SECVRITAS-REIPVBLICAE, Victory walking left, holding wreath and palm branch. 

Z in left field, dot over A in right field. 
Mintmark TES. 

RIC IX Thessalonica 27c, type xxxiv.

Contributed by Henry Grant, Feb. 2025.