The Opus 88 Demonstrator fountain pen is a truly unique writing instrument. This large non-postable pen is an eyedropper-filled pen with a piston operated shut-off valve.It has a black clip and a black stainless steel #6 JoWo nib and includes a glass eyedropper to fill the pen with your favorite ink. Made with a translucent dark brown finial and end cap, and an opaque light brown cap and barrel, Mocha Mousse is a limited edition design for 2025.
An ebonite piston and rubber gasket seals the feed off from the barrel when fully depressed, reducing the risk of leakage and burping. By unscrewing the blind cap and loosening the rod at the rear of the barrel, you open up the ink flow to the feed. During long writing sessions, leave the shut-off valve open to take advantage of the impressive ink capacity.
To fill, unscrew the section and use the included eyedropper to fill, then replace the section. To start writing, simply unscrew the blind cap at the end, which releases the middle piston rod's shut-off mechanism.
