I would think rather WMF Ikora than Loetz.

The crackle structure in Lötz is usually much thicker, and green would be an uncommon (though not impossible) colour.
Schaumglas comes in quite a limited variety of shapes, and this bowl doesn't really fit.
The base finish unfortunately is almost identical for both makers.
The number might be a pattern number, but unfortunately I don't have my Ikora book with me to check...
Here is a pic of a small red Ikora vase I own, which IMHO shows an identical technique to your bowl.
Michael