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 with star on the top, DN CONSTANTINI MAX AVG around, in exergue TSAVI
RIC VII 117. Round with complete designs. Extremely fine. Size: D: 18.7mm; 2.53g