Opus 88 Fountain Pens Manufacturer
Top Opus 88 Fountain Pens
Opus 88 Demonstrator
Opus 88 Omar
Opus 88 Koloro
Discover a masterclass in fine writing instruments engineered to deliver smooth ink flow, incredible capacity, and unmatched reliability for pen enthusiasts around the globe.
Product Categories
Eyedropper Fountain Pens
As the flagship category of Opus 88, these pens feature a signature Japanese-style eyedropper mechanism with an integrated shut-off valve that enables massive ink capacity and prevents leaks during travel.
Cartridge / Converter Fountain Pens
Designed for writers who prefer a traditional filling method, this refined collection utilizes standard international ink cartridges or converters for convenience on the go.
Replacement Nibs & Parts
This category offers modular stainless steel JoWo #5 and #6 nib units in various writing sizes, alongside genuine replacement feed units, O-rings, and eyedropper pipettes to keep your pen performing flawlessly.
Customer Reviews
Arthur Pendelton: I bought the Opus 88 Omar demonstrator three months ago for daily journaling, and the Japanese-style eyedropper system has exceeded every expectation. The massive ink reservoir lasts me weeks without refilling, and the shut-off valve completely eliminated burping while I was flying on a business trip.
Elena Rostova: The Koloro model with its combination of warm ebonite and rich acrylic is an absolute masterpiece in hand, providing incredible ergonomics during extended writing sessions. The broad JoWo steel nib wrote smoothly right out of the box with flawless ink flow and zero hard starts.
Marcus Vance: Upgrading my Opus 88 Mini Pocket pen with a 1.5mm stub nib unit was incredibly easy thanks to the modular screw-in housing. Having a ultra-compact travel pen that holds over 2 mL of ink while delivering line variation makes it the most versatile tool in my collection.
Opus 88 FAQ
How does the Opus 88 shut-off valve work?
The blind cap at the rear of the pen is connected to an internal ebonite rod with a rubber gasket. When fully screwed down, it seals the ink reservoir off from the feed chamber, preventing leaks and air pressure fluctuations. To write for extended sessions, simply unscrew the blind cap slightly to allow ink to flow freely from the barrel to the nib.
How much ink can an Opus 88 fountain pen hold?
Depending on the specific model, Opus 88 pens generally hold between 2.0 mL and 3.56 mL of ink. This is significantly more than standard cartridge/converter pens, which typically hold around 0.7 mL, making Opus 88 ideal for long writing sessions.
Are Opus 88 fountain pens safe for air travel?
Yes, they are exceptionally travel-friendly. Because screwing down the shut-off valve isolates the ink inside the main barrel, changes in cabin pressure won’t force ink out through the feed, preventing unwanted leaks during flight.
Can I swap the nib on my Opus 88 pen?
Yes, most Opus 88 models feature standard screw-in nib units—typically #5 or #6 JoWo units. You can easily unscrew the factory nib unit to clean it or replace it with another compatible JoWo nib size or custom grind.
Why does my pen stop writing after a few pages?
If your pen starts drying out while writing, check to ensure the rear shut-off valve is unscrewed slightly. While the feed holds enough ink for a quick note with the valve closed, long-form writing requires the valve to be open so ink can continuously flow from the reservoir into the feed.
What is the purpose of the O-rings included with the pen?
Opus 88 pens feature rubber O-rings to create watertight seals. One sits at the threads where the grip section screws into the barrel, and another resides inside the grip section behind the nib unit to prevent ink from leaking around the threads. Be careful not to lose these O-rings when cleaning or disassembling your pen!