I find the bird-like surface patch over the clear on this particular marble interesting.
Especially, in light of this post I made earlier in the ID section.
I think there is lots of contemporary millefiori out there and the marbles you are referencing are antique and far less common. My suggestion is to tread cautiously.
I must also say, much of my knowledge of Vitro marbles, and my affection for them, comes from Chuck B., without whom, I never would have been able to pull this one from a pile.
Well, I am glad that worked out as expected. A couple of years ago I had to convince brother Bill that this marble wasn't a Pelt or an Akro before he'd let go of it, and I sure didn't want to give it back!
I am with you! It's the only company where I have seen all of these colors.
As requested - one seam is a bit odd.
You were on it early, Joep, but I think this Vitro is from Vienna.
Hope you don't mind the edits, Chris, you've got to look close at this marble . . .
It's a seriously cool core, so fine, almost like a ghost latticino, there are more filaments than first catch the eye, for sure.