I have a number of 51's and definitely my favourite is the grey aerometric, with gold-filled cap; it just seems softer and smoother than my other pens. It also has a really lovely nib - incredibly smooth, slightly on the fat side of medium.
Do other people have particular favourite P51s - whether that's colour (I'll accept customised 51's in this - I have a soft spot for the yellow ones), nib, whatever?
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