An amazing collection! Great resource too. Here are my most recent Gallienus additions:
Gallienus AR Antoninianus. Colonia Agrippinensis, AD 257. GALLIENVS P F AVG, radiate, draped and cuirassed bust to right / VIRTVS AVGG, Emperor standing to right, holding spear and standard. RIC V.1 58 (Lugdunum, joint reign); MIR 882l; RSC 1309 (Lugdunum). 5.07g, 22mm, 6h.
Gallienus BI Antoninianus. Antioch, AD 266. GALLIENVS AVG, radiate, draped and cuirassed bust to right / IVBENTVS AVG, Emperor standing to left, holding Victory and spear; VIIC in exergue. RIC V.1 615 (Asia, sole reign) var. (bust type); MIR 1641a; RSC 415. 3.27g, 22mm, 6h.
From the N. M. McQ. Holmes Collection.
Gallienus BI Antoninianus. Mediolanum, AD 263-265. GALLIENVS AVG, radiate head to left / PROVIDENTIA AVG, Providentia standing to left, leaning on column, holding baton and cornucopiae, globe at feet on left; S in right field. RIC V.1 510 (sole reign) var. (baton, globe, S in right field); MIR 1088i. 2.61g, 24mm, 12h.