Meister Eckhart, 1924: title page (Franz Pfeiffer)
Theologia Germanica, 1893: title page (Dr. Pfeiffer)
Wikipedia 13 June 2021: (Franz Pfeiffer (February 27, 1815 – May 29, 1868), was a Swiss literary scholar who worked in Germany and Austria. He was born in Solothurn, studied at the University of Munich, and in 1846 became librarian in the royal library in Stuttgart. In 1857 he was appointed a professor of German medieval literature and philology in the University of Vienna. He died in Vienna.) https://en.wikipedia.org/wiki/Franz_Pfeiffer