Gallienus, 253-268. Antoninianus (Bronze, 21 mm, 3.29 g, 6 h), Siscia, 267. GALLIENVS AVG Radiate head of Gallienus to right. Rev. BONVS AVENTVS (sic!) AVG Gallienus on horseback galloping to left, raising his right hand in salute and holding spear in his left. Cohen -. V. Geneviève/D. Hollard, BONVS AVENTVS AVG: nouvelle lecture d'un rarissime antoninien d'adventus de Gallien frappé à Siscia en 267, BSFN 59/7 (2004), p. 193-7, fig. 1 and 2 (same dies). MIR 1432i corr. (reverse legend). Naumann 106 (2021), 726 corr. (same dies, but misdescribed). RIC -. Extremely rare, apparently the fourth and finest known example. A very interesting piece and exceptionally complete. Struck from a slightly worn reverse die and with minor areas of weakness, otherwise, very fine.