Watch List notes:

Constantine I. As Caesar, A.D. 306-307. Æ Follis (29.1 mm, 9.19 g, 6 h). Heraclea mint, struck A.D. 306-307. Rare. FL VAL CONSTANTINVS NOB CAES, laureate head right / GENIO POPVLI ROMANI, Genius standing left, pouring libations from a patera, and holding cornucopia; HTS in exergue. RIC 31. Fine. 

This officina is not listed in RIC.