“Mandate” addressed to Duke Salm [Vienna] [Unconfirmed]
Commentary from other sources:
1) “A mandate to Duke Salm is the first [document] to mention [the wearing of] a Jewish sign [in Vienna].”
Braumüller, Wilhelm: Urkunden und Akten zur Geschichte der Juden in Wien. Erste Abteilung. Allgemeiner Teil 1526-1847. Erster Band. (Wien; 1918) p. 3