Thanks Dirk and m!
Your help is highly appreciated

So the base finish doesn't mean much in this case, good to know (as I have never handled any Ikora piece I was uncertain).
m, you're right that mine has got a hole at the side for the wire (pic attached). I think there is some sort of cap missing which would cover it a little, though.
Another possibility is that the lamp has been rewired, and the hole was drilled then, as there is a hole in the metal fixture beside the two switches which is useless (other than for air circulation?)
Searching the web I found
this lamp which IMHO looks remarkably similar to mine regarding shape, particularly the foot, technique and fitting. They claim it to be by WMF and don't mention Ikora; but I am not sure if they just attribute it, or if it is marked in some way.
Added another detail pic of the decor against the light, showing the quite complex technique a little better. (btw, the pic is not blurry -- the decor is

)
Regarding Kralik -- there is not much information about Kralik from the 1930s to be found, so no idea if they may have produced similar things then...
Michael