1960's montblanc meisterstruck model 146

I am a pen collector based in India.Yesterday I came across a Montblanc 1960's Meisterstrock model 146 which is made of celluloid and has an ivory symbol on Top of the cap.I have 2 queries;
1)The price qouted is as higher than a new 146,since the dealer claims that celluloid and the ivory symbol is rare and the pen is very old and difficult to come by.
2)The washer of the filling system is missing and will have to be procured outside India.Could somebody please let me know where this part would be available and how much it would cost?
Thanks,

apoojara