Here's a brief history by Dr Marco Fazio manager of Centro Documentazione Alfa Romeo;
https://www.youtube.com/watch?v=oGphpHA0y_Q (https://www.youtube.com/watch?v=oGphpHA0y_Q)
PS Now all Alfa Giulia and Stelvio Quadrifoglio have hand painted badges (as depicted in this video)
Enjoy ;)