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.
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Mark B. Ledenbach's vintage Halloween collectibles blog.