Gratian AE3, Thessalonica. 

DN GRATIA-NVS PF AVG, pearl diademed, draped, cuirassed bust right.
GLORIA RO-MANORVM, emperor walking right, holding labarum and
dragging captive.
V in left field, star over B in right field, mintmark TES.

RIC IX Thessalonica 31, type xxxviii, rated scarce.

AAH coins on ebay, 2004.