Thank you so much for the help, Columbine and Sashimister. On one of the pages is glued a label with name and address of Minoru Aoki. So, maybe is could be a actual painter, but it is also possible that he glued that just to show that he is owner of the book (some kind of Ex Libris).
Is it possible to find out what is written in the rest of the postcard? I can upload a photo in higer resolution, if it could be helpful...
Columbine, I got this book from a lady from USA, who found it in her basement, where it stayed for decades, and she didn't know anything about its origin. She also didn't know anything about people who lived in that building before her.
