Here's the coin in question: Probus, AD 276-282. Roman billon antoninianus, 4.97 g, 23 mm. Lugdunum, AD 277(?) Obv: IMP C PROBVS·P·F·AVG, radiate and cuirassed bust, right. Rev: ABVNDANTIA AVG, Abundantia standing right, emptying cornucopiae held in both hands; IIII (officina 4) in exergue. RIC 17 is from so-called "Period I": Whereas RIC 60 is from "Period II": Questions: What's the difference between the coins of Period I and Period II? If it's a matter of bust style, it looks more like this one attributed to RIC 60, Bastien 195 by the ANS. What's the difference between Bastien 195 and 196? Sear dates the coin to AD 279-89; Bastien (?) to AD 277. When was this coin struck? And, of course post your coins of Probus, Abundantia, or anything you feel is relevant!