Not Jabo--size always matters.
I have run across these and taken them to shows for an ID.
Mine were one inch or therabouts I believe, I have two of of them in my collection somewere--lol.
Yours look smaller with much more blue involoved.
I was told that these are "Older Vacor". I was never able to verify it through research on the interweb or from any books.
I still wonder??
Cool stuf!!
Marble--On!!