A set of decorative initials that originated at Gravier-Anstalt von Schiller & Sohn, Stuttgart, and possibly was made by Georg Schiller (although that’s unconfirmed). Reproduced in the 1894 edition of Petzendorfer’s Schriften-Atlas as Kanzlei-Initialen.
Issued by Letraset in 1980 as Decorative Initials 6 (digital version by Fontek from 1999). Gerhard Helzel’s Barock-Initialen is another digitization.