Here is what I am thinking.
These are Akro “Prize Name” marbles that I am showing.
This type, with the purple hue, are all over the place with coverage of the purplish color, it will lean towards white on many occasions.
The OP may be a Jabo, they did make some very similar with this look involved.
I appreciate all opinions and hope for a few more.
I just love this stuff!
Marble—On!!