That letter is written in the early German script (or “earlier” German script), which when I think about it, I can read.  Then again, I can read Fraktur.  I read the entire Goethe Faust and Urfaust, AND the letters to Schiller, in Fraktur. I could also read low German at one time.

Bavarian, however, is another story entirely.  But any Bavarian will put their nose up and say, “It’s Allemanisch, not German!”  With the connotation that YOU, stupid outsider, will never learn or know it.