Festival of Isis and related issues. Constantine II, as Caesar, 316-337. AE (Bronze, 15 mm, 1.30 g, 6 h), celebrating Constantine I's quindecennalia, Rome, 321. CONSTANTINVS IVN NOB C Laureate, draped and cuirassed bust of Constantine II to right. Rev. PRINCIPI I-VVENT Constantine II standing front in military attire, head to right, holding spear in his right hand and globe in his left. Alföldi -. Ramskold, Festival (2016), Group 5.4, p. 226, 87 (this coin, Ø33/R30) and pl. 6, fig. 087. RIC -. Extremely rare, one of two known examples. Minor traces of cleaning and with some deposits, otherwise, good very fine.