I have come to the realization that I simply don't want purchase another pen that uses a cartridge/converter as it's primary filling system. They are just so inefficient.
Now, note I said primary filling system. Many c/c pens are easily converted to eye dropper fill so I can justify that one; and other pens have other redeeming qualities, such as the wonderful nib of the Namiki Falcon or the beauty and feel of a Nakaya or a vintage pen that I have been wanting. But otherwise, almost every pen that I have acquired recently is not a cartridge/converter fill.
The Pilot Custom 823 is no exception.
The Custom 823 is unique among modern Pilot pens, almost all of which utilize a c/c filling system. This pen utilizes a plunger/vacuum filling system. This system is easily filled and the pen holds a HUGE amount of ink.
Another lovely feature of this pen is a huge #15 size nib.
The 823 is a demonstrator type pen and it's really cool to watch the ink level slosh around inside of the pen.
I simply have to include the following copy of a patent drawing from 1939, I found it while researching the plunger filling system. If you look closely at the internal workings of the 823, it uses this exact system, which was designed to simplify the plunger filling system of the day. I thought that it was interesting.
But as with any pen, all of the pretty packaging and efficiency is for naught if the pen does not write well. No worries here, this pen is a wonderful writer right out of the box. It writes smoothly and well. Definitely a keeper of a pen.