Described as " light radiate fraction", this bronze coin of Diocletian weighs 2.1 g. and is attributed as RIC VI - Cyzicus - 16A. Reverse has Diocletian receiving victory on globe from Jupiter who is completely naked, standing left and holding scepter. K Gamma in lower center.
These come for all four of the tetrarchs. Mine is Maximianus and weighs 3.0g which is closer to the RIC 16b expected figure. 'Light' here refers to the fact that there are rare 'heavy' coins that look similar (with a dot in exergue, I believe) that weigh almost twice as much. I know nothing about 'why'.
Here's a post-reform radiate that's lightweight, too, at only 1.74 g. From a bulk lot: Diocletian, AD 284-304. Roman Æ post-reform radiate, 1.74 g, 19.5 mm, 5h. Heraclea, AD 296-298. Obv: IMP C C VAL DIOCLETIANVS P F AVG, radiate, draped and cuirassed bust right, seen from front. Rev: CONCORDIA MILI-TVM, Diocletian standing right in military dress, receiving Victory on globe from Jupiter leaning on scepter; ΗΓ in lower center. Refs: RIC 13 or 21; Cohen 34; RCV 12833.
