Watch List notes:

Constans. A.D. 337-350. AE 4 (14.2 mm, 1.14 g, 6 h). Rome mint, struck A.D. 337-340. Rare. CONSTANS P F AVG, pearl-diademed, draped, and cuirassed bust right / VICTORIA AVG, Victory advancing left, holding wreath and palm branch. RIC 103 var (bust type, reverse legend); Failmezger 387 var (Constantine II); LRBC -. gVF. 

Unpublished in standard references. This coin featured at Wildwinds.com