Pamela — No, it's not marked, but it might have been. What happened to Niemen's moulds when they closed in 1945 (Haanstra, but that may be an approximation) or stopped fancy glass production? Beautifully designed, they would have had significant commercial value, and be quite attractive to the likes of Walther. A buyer would have removed any marks.
That blue looks post-war to me, but I have little experience of mainland European pressed glass. What do you think?
Bernard C.