We had the books when I was little, but what I remember the most is the live-action french version from the 60’s. Unfortunately, they seem to have vanished with time. I kept thinking about those episodes and I finally struck gold last night when I found two clips, in German (I think?) on youtube. When I heard that theme song I became so giddy and happy, I started to clap my hands on my knees and hum along.
Turns out you can get them on Amazon! All 11 episodes! Thank you internets, for making sure I can get just about anything I want, with a little detective work.