Watch List notes:

The Roman Empire

Constantine II augustus, 337 – 340. Commemorative issue, 330 – 354. 1/3 siliqua, Constantinopolis circa 330, AR 0.96 g. Pearl-diademed and draped female bust r. (Helena ?), wearing earring and necklace. Rev. K within border of dots. C 287 (Constantine II). Mazzini 287. Bendall RN 158, 2002, 4.
In exceptional condition for the issue, virtually as struck and almost Fdc