The Germans produced a total of twelve tiara or diadem designs during the 1920s. All of them are hard to find in collectible condition, but this is arguably the toughest and the most eye-catching. This devil design brought only an ~18% premium to sustainable guide value, smaller than I would have forecast given that one hasn't surfaced in some time. Undoubtedly, if this had been offered for sale in August, it would have fetched far more.
Mark B. Ledenbach's vintage Halloween collectibles blog.