Watch List notes:

Commemorative Series. A.D. 330-354. Æ 4 (12.1 mm, 1.33 g, 5 h). Heraclea?. [VRBS ROMA] , bust of Roma left wearing visored and crested helmet and ornamental mantle / VOT XX MVLT XXX, in four lines within wreath. cf. RIC 49. aVF, struck on a small flan. 

The attribution to Heraclea is not certain since the mintmark is off the flan.