Jmk wrote:
Most modern fountain pens are piston fillers or filled by
a cartridge or converter. If your pen is the latter, it usually comes
with a converter and cartridges are usually easy enough to find.

As you said, the Pelikan M200 is piston-filled, though I'm not sure what
that is. Is there a downside to this? Is the ability to use cartridges
better?

--
Iain Dalton