Well, it is obviously out of round and that does look like a pontil.
The Images here are just too blurred to make an accurate ID.
Hold your elbows close to your chest and anchor them there.
More light is needed as well--sunlight is the best, take this one outside into the natural sunlight and get back to us with better results.
Imaging marbles is not so easy but we need clarity for a proper ID.
You will get it, I know that you will..Just take your time and do this marble justice.
Marble--On!!