Hello, I have this Montblanc Meisterstück (Rollerball), I don't really want to spent 20chf for 2 ink official refil. Do you know which one can be compatible? I see: ISO 12757 " H M DOC (Feb13) on the original ink I have.. Thanks!

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It is very confusing, because sometimes a line width of 0.3 mm is stated, but the picture says 05, for example. Which is really correct and which are the appropriate pens? If the lines are too thin, they dry out quickly.

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