It is believed that the portrait shows Princess Maria Bertha Franciska Felicia zu Rohan.
However, it was not the intention of Oesterreichisch-Ungarische Bank to select this portrait due to the fact it shows a representant of an aristocratic family. In these days the identities of the persons displayed on Austrian banknotes were even kept secret. The task of the artist was just to work out a portrait showing an "ideal child's head". He was free to select any model which he deemed suitable.
(Information given by Rudolf Richter, Salzburg - Specialist on Austrian paper money, July 2009)