I bet they are. This is a crash course.
12 different ones is a lot for one thread. Even experienced eyes get tired.
I'll give 'em a shot. I'm only about half done but hitting enter now to save. Will keep looking at the other marbles and may fill in some more blanks. [Edit: Okay, I've made all my guesses now.]
1. I think this is a Vitro.
2. More views, please.
3. Marble King Rainbow (Note the MK Rainbow is spelled with a "w" on the end, while a Pelt Rainbo is spelled without the "w" )
4. Strange Marble King?
5. I do not know. More views might help.
6. Peltier Rainbo
7. Peltier Banana (a type of cat's eye) (there are non-Peltier bananas also so I won't 100% say this one is Pelt but put your bananas together for awhile and treat them as Pelts)
8. Master Marble. Might be called a Sunburst.
9. Vitro Tiger Eye
10. Peltier Rainbo
11. West Virginia swirl
12. West Virginia swirl? (I'm not sure this one is vintage. If newer, then I'd say Jabo.)