Watch List notes:

Constantine I the Great AD 307-337, Siscia Mint, ca. AD 320-321.
Laureate head of Constantinus I right, CONSTANTINVS AVG;
VOT_XX with star below, all within wreath, DN CONSTANTINI MAX AVG around, in exergue TSAVI
RIC VII 110. Upward gaze portrait. Slightly oval flan. Some reddish deposits. Very fine Size: D: 19.7mm; 3.45g