None of these covers shows "the" Dune font, for me. The first edition of Dune had a very stylized calligraphy that looked like arabic. I remember it vividly since my dad had this book in the living room, among others; and when I was learning to read, this was the only cover that I couldn't read at all. (It was a translation, but with the same cover.) These letters are shown on the wikipedia page about the novel: http…
For those interested: https://m.media-amazon.com/images/P/B08HPFCMLS.01._SCLZZZZZZ...