It's a shame I didn't do some research on this before:
original feature length: 91 mts (ca 88 mts pal)
original aspect ratio: 1.66 : 1
original language: german? spanish?
This edition is presented in 1.33:1 and even states this was the original aspect ratio, while watching the film you can clearly see there's something missing.
This edition runs 76 minutes and is heavily cut. Being a very weird, arty, and (I guess) gory experiment, there's really no point in watching the movie in such a way as it is presented by Starz Home Entertainment.
The dubbing is english and not very good, but as far as I could find out, there's no other language-edition available (there seems to exist a spanish-version-DVD out of print).
So what's there to do?
There's a Blue Underground edition available (reg 1), which runs 91 mts and is presented in 1.66 : 1.