First, take that steelie out of the group. Marble collectors cringe to see the metal near the glass.
Next, if you can sort out the ones that don't have nicks or wear, you might want to sell those separately from those that have more wear.
Learning to grade the condition of marbles and to identify them by maker are both skills which take a long time. But if you can at least learn to grade condition enough to separate out any mint or nearly mint ones, you might be able to get bigger dollars on those.
And then whatever you got on the leftovers could be bonus.
Just a thought.
Selling marbles can be an inconsistent game. Especially if it's not someone's specialty.