I was so lucky to get this Musterbuch (German for 'book of patterns or samples') from my sister-in-law. She found it in an antique shop in Poznan, Poland where she lives and thankfully thought of me! I have seen collections of tatting, fine crocheting, ribbon lace, embroidery, etc. like this in museums and always longed for something similar for myself, but have yet to do such intricate work myself.
According to the information my sister-in-law got from the antique dealer, these were made by a Polish woman (either of German descent or attending a German-run school) who had to make these samples to show off her proficiency for a degree in needleworking. Interestingly, the woman's name is Helene, the same name as my youngest daughter, so that has made this little collection even more meaningful.