I don't see Vabalathus turn up often as a single coin, much less mixed in with random unattributed lots, so this auction was quite fun to win (assuming they're not fakes!)
My guesses as to identification - can you refine or correct them? (Going clockwise around the picture)
1. Vabalathus / Aurelianus AE Antoninianus.
RIC V.1 381, gamma (3rd officina)
IMP C AVRELIANVS AVG / VABALATHVS VCRIM DR
2. Gallienus AE Antoninanus.
RIC V.1 612 (Asian mints)
Radiate & cuirassed bust right / Mars? standing right, holding spear in left hand and leaning on shield with right hand / "PXV" in ex
GALLIENVS AVG / VIRTVS AVG
3. Constantine I (commemorative) follis (?)
RIC VIII Antioch 37, poss. 7th officina (SMANΗ ?)
Veiled bust right / emperor driving quadriga with star in field and manus dei above, mint in ex.
DV CONSTANTI-NVS PT AVGG / no rev. legend
4. This one is killing me. AE something or other. Head looks eastern style and later empire. Can't read the legends, except perhaps "DN..(A?)(R?)C(A?).." obverse. My GUESS is possibly Arcadius based on the draped bust and beaded head; the reverse appears to be a "Victory crowning the Emperor" type, executed somewhat crudely (?), and there is a mintmark, perhaps Antioch or Cyzicus (?) -- could this be an imitative issue or just a poorly engraved branch mint?
5. Constantius II (?), AE3 or thereabouts if I am right
Diademed, draped, and cuirassed bust right
"Soldier spearing fallen horseman" reverse
Constantinople mint, CONSε perhaps, or Θ ? in ex. Reverse legend mostly gone but presumably FTR.
There does appear to be a center dot but no visible field marks.
Looks similar to RIC VIII Constantinople 121 (Epsilon) in design and legend breaks. Rotated picture below to fix rev. orientation.
DN CONSTANT-IVS PF AVG / FEL TEMP RE-PARATIO