A letterhead alone is not proof of authenticity, and the internal model number M999 stands at Montblanc merely for "other" and says nothing about brand affiliation. If a writing instrument is submitted for repair and not repaired, it appears in the letter with this collective code without Montblanc thereby confirming its originality. The white dot alone does not make a no-name pencil into a Montblanc; decisive are the typical brand features on the writing instrument itself.