An unusual cane-cut marble though, yes? Semantics where the pole opposite the pontil could be referred to as 'melted'. Very large size for a vintage German marble of this type, but not to say this couldn't be one.
On a side-note, the underwater picture trick isn't a good representation of how it would actually look without the haze - makes the core look more shrunken (although there does appear to be a fair amount of clear glass casing).