Watch List notes:

Constantine I the Great AD 307-337, Thessalonica Mint, ca. AD 320-321.
Laureate head of Constantinus I right, CONSTANTINVS AVG;
VOT_XX within wreath, DN CONSTANTINI MAX AVG around, in exergue TS_VI
RIC VII 104. Lovely, very detailed portrait. Very fine. Size: D: 19.0mm; 2.91g