Alternatively, maybe there's a color negative film with ISO 44? For example, old films had lower ISO. Some early films had ISO like 10 or 25, but ISO 44 is not standard. Perhaps the user is misremembering the model numbers. Alternatively, it could be a different brand. Agfa once had some color films with unique ISO numbers, but I can't recall an Agfa film with 1391 or 44 in the model.
