Constans. Thessalonica. 333-335 AD.

CONSTANS NOB CAES, laureate, draped, cuirassed bust right
GLORI-A EXER-CITVS, two soldiers holding spears and 
shields with two standards between them. O on banners.

Mintmark: SMTSB

RIC VII Thessalonica 201 var (unlisted officina), rated R5

RIC lists only off. delta for Constans.