This brooch was designed by Josef Hoffmann. A blueprint and a photo made back around 1910 exist in the archive of the Wiener Werkstaette in MAK Vienna.
Beeing in a very good condition, this is a very exquisit object. There are no visible damages, only very small wear from usage. There are two hallmarks on the back, the "WW" signet of the Wiener Werkstaette and the Austrian tax mark for silver 900 fine.