Thanks for the response! I can guarantee the one I am showing is glass. A new photo would show a giant fracture in it thanks to a dusting incident that happened several years ago - I'm almost over it. 😭
It seems to me the vast majoriry of Vitro Conqueror and Victory mesh bags have veneered marbles in them. These look more like Parkersburg Vitros to me.
Al would likely know how true this really is.
I thought I better start a new thread since we were diverging pretty far from the Lets See Your Master Mibs topic.
This was Bill's box and these are his pics too. @mibcapper
It is a lot like the Master #10, but probably even more rare.
An old fashioned "Lite Brite", just over 100 years old and not one of the 600 tiny clay marbles is missing - what are the odds?
Sorry for the less than ideal photos.