This Namiki / Pilot converter is a twistpiston converter for Namiki/Pilot fountain pens.
Four small metal ball bearings inside the barrel help break up surface tension air bubbles for a smoother ink flow. Transparency allows you to easily see the ink.
all Pilot and Namiki fountain pens
including Metropolitan, Metro, and Vanishing Point with a screw-type Piston converter
This converter replaces 69899.
Manufacturer part number 69810 (CON-40). Made in Japan.