Numerous replica sites can be found online; a Google search for 'Montblanc Replica' yields over 1000 hits, partly supplemented through advertising via Google AdWords. Some suppliers use 'liability disclaimers', which legally do not protect. If one site closes, others open under a new name. The 144 specifically described is an original; older 144s did not yet have outside feed lamellae and a fully gold nib without platinum inlay. Hard-rubber feeds were fitted up to about 1989; today's outside lamellae increase buffer capacity at pressure fluctuations.
Related pages on fountainpen.de:
• Montblanc Meisterstück 144 (Classique predecessor): https://www.fountainpen.de/c-montblanc-meisterstueck-144-en.htm