Watch List notes:

Helena. Augusta, AD 324-328/30. Æ Follis (19mm, 3.06 g, 6h). Siscia mint, 3rd officina. Struck under Constantine I, AD 328-329. Diademed and mantled bust right, wearing necklace / Securitas standing left, holding branch pointing downward and raising pallium; ΓSIS (double crescent). RIC VII 218. With considerable silvering, dark green surfaces beneath. Good VF.

From the Dr. John Whitehead Collection, purchased from Civitas Galleries.