Marco, you're correct, praun is braun (brown). In parts of Germany around "Augspurg" (Augsburg), southern Germany, and a part of central-eastern Germany, the letter "p" was frequently substituted for "b".
And I know you already know this, but for the Voynicheros who aren't familiar with Latin abbreviations, in "aun", the "n" is represented by the tail that swoops back over the letter "u" (the same glyph-shape used in VMS "daiin").
And I know you already know this, but for the Voynicheros who aren't familiar with Latin abbreviations, in "aun", the "n" is represented by the tail that swoops back over the letter "u" (the same glyph-shape used in VMS "daiin").