This is a vintage machine-made marble manufactured by Akro Agate in the United States during the 1930s. The marble is 1.38 inches in size and has a beautiful cobalt blue and onyx coloration. The style of the marble is onyx.
Gorgeous marble in hand.   It does have some folds.  I could find no pin pricks or chips.   It is fair to say NM plus !!
Thanks for visiting my corner and check out my other vintage marbles listed this week.
always glad to combine shipping.

NOTE:    Please allow five business days for handling.