The Vabalathus and the Postumus I like especially. I don't know Greek coins well, but they look alright too!
That single coin looks to be a very crude barbarous imitation example of Tetricus I. The reverse is a standing figure probably Salus or Spes with Victory or Nike on extended arm. There is also an altar which is common for Salus. The lot ain't bad but a lot of them are already cleaned. I usually try to avoid lots like that because they don't have much dirt on them but there are others in your lot that might turn out ok. I wouldn't sweat it for that price and it is good to practice on to improve your cleaning skills.
Yeah, I really like the Vabalathus/Aurelian coin and the Postumus as well. Greeks and Roman Provincial coins take a lot of study and time to learn. But hey, I have all the time in the world to enjoy those coins.
The legend reads (TET)RICVS and you are right about it being a barbarous radiate. They are very common as a group and hard to find two exactly alike.