According to Maco, it's the same as their former Genius Film. The GF datasheets says its ISO 25.
However, since this is ortho chromatic, its not exactly the same, but because of that very lack of red-sensivity, you can tray develop by expection, and get what you want. You should be able to rate it 10 and get good results.
Read here: http://www.macodirect.de/rollei-shee...ts-p-1085.html
Heres a link for the datasheet of GF: http://www.maco-photo.de/files/image...ntfilm_eng.pdf
Edit: I had some information wrong.