Constantine I, AE follis. 

Obv: CONSTANTI-NVS MAX AVG, rosette-diademed, draped, cuirassed bust right 
  (the bust with a very large, goitre-like neck) 
Rev: GLORI-A EXER-CITVS, two soldiers holding spears and shields with two  
  standards between them, o on banners. 

Mintmark: SMTSB

RIC VII Thessalonica 198 unlisted var (officina letter B is unlisted), rated R5

Contributed by Dane for George Clegg (biggyg2), October 2007