The imprint "W-Germany" on the clip indicates production before 1989 (pre-reunification period) and matches a white-gold nib with yellow-gold rim. Earlier Meisterstücks did not yet bear a serial number; this was only introduced later. Since counterfeits often also bear serial numbers, their presence is in any case not a reliable authenticity criterion. A definitive authenticity check is most safely carried out at an authorised dealer on the spot. Based on additional photos, the piece described looks genuine.

Related pages on fountainpen.de:
• Montblanc Meisterstück 149 (Grand Format): fountainpen.de/c-montblanc-meisterstueck-149-en.htm