SilverWook said:
I admit I've not heard of a 9.5 mm film format before! Some forgotten competitor to 8mm?

The surface area is actually pretty close to 16mm, but there were no sprocket holes along the side. Rather, there was a single wide hole below each frame. It was easy to make because film companies could just chop up 35mm stock into three strips. The format was a popular home movie format in the 30s in Europe.

(http://en.wikipedia.org/wiki/9.5_mm_film)

Getting back to Metropolis, it seems TransitFilm/Filmmuseum Munich is already busily restoring the print, as Kino has confirmed the new version is planned for a Blu-Ray release next year.

Hope you saved your work files. :D