Opal in the white--at least some of the white.
I think that this one is a Pelt--lets ask @Chad G. and @Fire1981 for an opinion here.
Nice marble.
Marble--On!!
"Melon Balls" are one color in my experience at least.
There should be some sort of "Pontil" included.
This one appears to be machine made and if I had to guess on the maker it would be Master.
Marble--On!!
There is no AV here that I can see.
These used to be called Akro "Experimentals"--this one is a dug Akro imho.
The cutlines line up with what I think.
I appreciate all opinions and hope to see some more.
Marble--On!!
This is a classic example of a veneered marble.
Notice the white that shows in the cutlines.
If you were to break this one open it would be all white inside.
I think that @Melissa has some input to share here.
Marble—On!!
Vitro Oxblood is a bit weird--if it were mine--I would call it ox for sure.
Of course, I appreciate all opinions and hope to see some more.
Marble--On!!
Al and Ric are right one with this one.
It is a nice find and a great ask--a keeper--these are quite old and getting harder and harder to find.
Marble--On!!