Ferrania stoped film production a while ago now. So if they were the supplier, the sorce will have to change.
The look at the edge printing trick will work sometimes, I used to us it to decide if cheap depertment store colour film was fuji or Konica. As others have said, it only works if the original factory did the conversion from master rolls. If a small firm does not have the right packaging equipment the film may have no edge markings, or unique edge marking no mater how made the stock they are converting.