That is indeed the one vase I have seen from them, along with the foam glass vases mentioned on the Murano forum. Ichendorf was located in Bergheim-Ichendorf, Germany and went under at the end of the 70s - at that time the main designer was Alfred Gunther. I think you'll have a hard time finding out about the factory, I don't think much has been published.
As said, the current Venice glass dealer operating under the same name may or may not be related - I have no idea.