The name Franziskaner today is most often associated with the Bavarian weiss beer brewed by Spaten, but originally it was a separate company known as Franziskaner-Leist-Bräu. The word “Franziskaner” means Franciscan, which is why there’s a monk on the labels nowadays. They merged with Spaten in 1922, so today’s ad is undoubtedly before then. Poster companies selling a reproduction of today’s ad all say it’s circa 1930, but given the earlier merger I’m not sure that can be right, unless of course it continued as a separate brand in their advertising. The artist’s name is either Maurus or Maueus, but that’s a close as I can pin it down.