Pelikan and Geha school fountain pens
Is it possible to buy cap or nib separately?
Yes, at shops specialising in writing implements.
Are there special fountain pens for left-handed persons?
Yes, because of their special profile, fountain pens for left-handed persons have to be designed differently from pens for right-handed persons.
Does Pelikan also produce school fountain pens with a plunger system?
No, but you may insert a converter into the cartridge fountain pens so that they can then be refilled out of the ink bottle.