I think we're on the right track of it being constructed of two separate canes, given the complete lack of symmetry, the fact the colorful ribbon is facing inward (instead of outward) and the bubble/ghost part. If it were intended to be a latt marble the rest of the cane if properly executed would be spectacular.
MC Marbles asked: "Are not all German Hand-Made marbles made from groups of glass rods fused together?"
The answer is (mostly) yes, but the rods/patterns are usually a lot more concentric from layer to layer building outwards which is where the symmetry comes from once it's twisted
Which brings in the possibility it was close to the end of cane of spectacular marbles where the glass was folded over itself and made a weird pattern.
I might have a couple pics saved of fused marbles across the equator which are easier to make out what happened