Constantine I. AR medallion of four siliquae, 39 mm. 12.87 g. Thessalonica, ca AD 336. 

AVGVSTVS, rosette and laurel diademed head right.
CAESAR in laurel wreath.

Mintmark TSE. 

RIC VII Thessalonica 221.

Re-used by permission of Harlan J Berk (www.harlanjberk.com) and
 Freeman & Sear (www.freemanandsear.com. Gemini III, lot 460, Jan 2007)