Vitro Agate Co Victory Marble with large inclusion

This is a Vitro Agate Company Victory Marble, probably made in the 1940s or 1950s. While it is not a rare marble type, what is highly unusual about this marble is the large inclusion in the marble. The chunk of debris looks like a pebble inside. The marble is generally glossy, but was used with a 2mm chip, ticks, and sparkles.