Lovely, and every attributed piece helps my Ichendorf knowledge. I didn't know they did these sort of inclusions. Like you said, Ichendorf info is really scarce.
I only have one Ichendorf I'm sure of (the famous Tüsselman design), and one I think is perhaps Ichendorf, but can't remember (I bought a lot of German glass that day, and when I got home I had forgotten the attribution of that particular piece. Aargh).
I'm always looking for places to find out more about German glass then I already know. I guess we could use a few more threads dedicated to posting the works of a particular company (like the Skrdlovice thread over at Czech glass), especially if there are no books on that company available. Most of what I know I picked up by seeing labeled ones for sale on ebay (which would be a lot easier if some Germans weren't obsessed with slapping 'Joska' labels on everything they offer for sale, sigh.