Are M400 and M200 nibs interchangeable? I thought I read this somewhere. I'm looking for an OB and they are sold out for the M400 in many places, but are in stock for M200.
I had an M600 nib in my M200 pen and never had any problems with the nib hitting the cap. I guess I was lucky or YMMV with pens also.
Well, do what you like. It may have to do with where the inner cap sits or how deep the nib is in the collar. I don't gamble with $100 nibs.
From Binder's site: This nib does not fit M2xx, M4xx, etc., or the old-style (pre-1995) M600. It will screw into these pens, but it is longer and is likely to collide with the end of the inner cap when you cap the pen.
From Mottishaw's: Pelikan M600 two-tone 14C nib unit. When set deeply enough it will fit the M400 and M200 series pens as well.
I just threw the warning out to save someone unnecessary grief.
PS I have a special Pelikan knock out block and can reset nib/feed for anyone if necessary