Constantine I AE follis, Heraclea.

CONSTAN-TINVS AVG, head right wearing ladder-shaped diadem
decorated with pearl in each section.
D N CONSTANTINI MAX AVG around VOT XXX within wreath.

Mintmark dot SMHB.

RIC VII Heraclea 90.

With permission of www.slaveycoins.com, March 2012.

Note: Heraclea used a lot of different diadem types
for the votive coinage of Constantine, with more variations 
than any other mint.