though you nice bowl seems very similar to WMF Ikora glass at first sight, IMHO it is rather not.
The exterior has open crackle as far as I can see, not something I have ever seen with Ikora glass.
The base finish seems wrong, too. Ikora pieces usually have a flat polished base, early pieces a perfectly circular pontil mark.
The shape is not in the Ikora book either.
Sorry I cannot be of more help.
There were several glassmakers particularly in the Art Deco period producing pieces with crackle pattern...