Ferrari / Pininfarina Foglio allestimenti - factory sheet

Last week I was in contact with someone who was promoting a Ferrari 365 GT4 2+2 being for sale. When making some  inquiries regarding it's origin and details I got send this photo (click to enlarge).

It's a copy of the factory sheet which holds details regarding the assembly nr, chassis nr, etc. By the looks of it the assembly nr might be leading rather then the chassis, which is updated by hand. I have not seen such file before so I welcome any input from the incrowd regarding this sheet.