The oldest, and possibly rarest adult book I own. It's so old the staples have rusted apart and stained the pages (especially the left side of page 26).
"Bizarre Straf Praxis" approximately translates to "Bizarre Penal Practice". The book doesn't have any publication information, but the Internet claims it was created by a man named Paul Proett or Prött, who lived from 1880 to 1945 in Köln, Germany.
I've found a few pictures of fetish orthopedic devices with the same name and art style scattered online. If you know anything further about the artist, or can point me to more information or pictures, PLEASE let me know.
If anyone is particularly interested in translating this, I do have a file with all of the text.