Roberto

The first could be the Champion, the second yes, Master

Many jabo for me

I think of jabo

In part, I agree with this

Well, the base of mine is a bit different, but the structure looks like that... (I think there are several fractures in the op)

The big one is a Bulgarian handmade, I have a similar one, ... then I will post photos ....

Yes, ghosts are more stringy

No ox blood, to the right vitro "buttermilk" I think

I think they are all Akro, except the first one?

Vitro for me too

Heaton for me

Yes Alley

Mmmmh.... Gold is very beaten, but I don't think it contains lutz.

Master

I agree, I also see this possibility

Each company had its own particular structure / motif in the construction of marbles, although they could be very similar to each other, such as Heaton and Cairo Some reasons may be distinguishable for a particular company, so what is certain, others (in the case of the third and fourth photos above) are just feelings that you can have Sensations, for the structure of the swirl and in the way it swirls, already seen in that particular company but, without being completely sure

The one at the bottom, blue, with white veins should be a wirepull veiligglas ( Olanda Amsterdam)

Yes, there can be different variations with similar shades, this is the first that came to my hands,.... now

You are welcome, also possible Heaton here

Heaton for me I have similar, very beautiful with that black cherry

Yes, I must say that my first impression was that, especially for the reason of photo three and four, but without being able to confirm it... obviously

Yes, "transparent swirl" with inclusion

Many slags including Akro may have a 9 pattern not just MFC

Not MFC for me, but I think more of Akro

That's right, no ox