This is number nine out of twelve typefaces for my upcoming Art Nouveau design kit. Wallenstein is another Heinz Keune design, from 1903. This came in a solid and an outline version, which were recommended to be used together to create a two-tone effect.
I'd love to have more of those awesome ornaments, but I've only been able to find these two pieces. They're from the title page of a specimen of "Mimosenzierat" by Schelter & Giesecke. If anyone has that specimen, I'd love to get some photos or scans of it.