The Pforzheim Album 5

It's more than the class photo that makes me think this album belonged to a teacher.  All the photos in the album appear to have been taken by professional photographers.  Posing the woman with a book hints at someone with an interest in the intellectual.  I don't know about Germany in the 1920s, but in the United States, at that time, teaching was one of the few jobs held by a woman that required a college education.  I doubt it was much different in Europe.