Fountain Pen Collectors

any info would be greatly appreciated.

This is a letter from the duke of earl, written to an individual one day prior to him renouncing his throne to his brother.  It is in good condition.  Curious on what it would be worth.

Mostly covered with elaborate hand carvings, covered in thick layer of 14Kt Gold, bezel set into top of pencil is a cabochon piece of black jade measuring approx. 8.20 MM in diameter. The numbers 585 are engraved onto pencil clip. What this means I do not know. I have more pictures available if need be. Any information about this piece would be much appreciated.

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