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The TWSBI Diamond 580 fountain pen blends modern engineering with classic demonstrator style, making it one of the most beloved pens in the TWSBI lineup. Crafted with a faceted, diamond-cut barrel, the 580 beautifully showcases your ink while providing a comfortable, balanced writing experience for everyday use.
Built with TWSBI’s signature piston-filling mechanism, the Diamond 580 offers a generous ink capacity and smooth, consistent flow. The transparent body allows you to monitor ink levels at a glance, while the precision-engineered stainless steel nib delivers a reliable and customizable writing experience. Designed to be user-serviceable, the 580 can be easily disassembled for cleaning and maintenance—perfect for fountain pen enthusiasts who love to tinker.
Aluminum machined grip, connector, and piston rod.
AL Models have a smooth grip section.
ALR Models have a ribbed textured grip section.
The TWSBI Eco fountain pen has earned its reputation as one of the best values in the fountain pen world combining thoughtful engineering, impressive ink capacity, and everyday reliability in a clean, modern design.
Featuring TWSBI’s signature piston-filling mechanism, the Eco allows you to fill directly from a bottle of ink, offering a generous ink reservoir that keeps you writing longer. The transparent demonstrator barrel lets you easily monitor ink levels while showcasing your favorite colors. Its lightweight construction and balanced feel make it comfortable for extended writing sessions, whether you’re journaling, note-taking, or sketching.
Fitted with a smooth stainless steel nib in a range of sizes, the Eco delivers consistent ink flow and dependable performance right out of the box.
The TWSBI Eco fountain pen has earned its reputation as one of the best values in the fountain pen world—combining thoughtful engineering, impressive ink capacity, and everyday reliability in a clean, modern design.
Featuring TWSBI’s signature piston-filling mechanism, the Eco allows you to fill directly from a bottle of ink, offering a generous ink reservoir that keeps you writing longer. The transparent demonstrator barrel lets you easily monitor ink levels while showcasing your favorite colors. Its lightweight construction and balanced feel make it comfortable for extended writing sessions, whether you’re journaling, note-taking, or sketching.
Fitted with a smooth stainless steel nib in a range of sizes, the Eco delivers consistent ink flow and dependable performance right out of the box.
The TWSBI Eco fountain pen has earned its reputation as one of the best values in the fountain pen world—combining thoughtful engineering, impressive ink capacity, and everyday reliability in a clean, modern design.
Featuring TWSBI’s signature piston-filling mechanism, the Eco allows you to fill directly from a bottle of ink, offering a generous ink reservoir that keeps you writing longer. The transparent demonstrator barrel lets you easily monitor ink levels while showcasing your favorite colors. Its lightweight construction and balanced feel make it comfortable for extended writing sessions, whether you’re journaling, note-taking, or sketching.
Fitted with a smooth stainless steel nib in a range of sizes, the Eco delivers consistent ink flow and dependable performance right out of the box.
The TWSBI Diamond 580 fountain pen blends modern engineering with classic demonstrator style, making it one of the most beloved pens in the TWSBI lineup. Crafted with a faceted, diamond-cut barrel, the 580 beautifully showcases your ink while providing a comfortable, balanced writing experience for everyday use.
Built with TWSBI’s signature piston-filling mechanism, the Diamond 580 offers a generous ink capacity and smooth, consistent flow. The transparent body allows you to monitor ink levels at a glance, while the precision-engineered stainless steel nib delivers a reliable and customizable writing experience. Designed to be user-serviceable, the 580 can be easily disassembled for cleaning and maintenance—perfect for fountain pen enthusiasts who love to tinker.
The Platinum #3776 Cherry Blossom Celluloid fountain pen features a delicate cherry blossom pattern set in soft pink celluloid with elegant gold trim. Rare in modern penmaking, celluloid is prized for its depth, warmth, and luminous finish, and requires months of careful curing to perfect.
Fitted with a smooth 14k gold nib, this pen uses Platinum proprietary cartridges or a converter for bottled ink. Both are included, making it ready to write right out of the box.
Specifications:
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Body Material: Celluloid
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Trim: Gold
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Nib Material: 14k Gold
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Filling Mechanism: Cartridge / Converter
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Compatible Inks: Bottled ink, Platinum proprietary cartridges
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Body Diameter: 12.0 mm (0.47 in)
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Grip Diameter: 10.0 mm
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Overall Length (Closed): 136.8 mm (5.39 in)
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Body Weight: 13 g (0.46 oz)
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Postable: Yes
The Opus 88 Demonstrator Sapphire fountain pen makes a bold impression with its sparkling, swirling acrylic resin in a rich sapphire blue. Its clean, cylindrical profile with flat ends highlights the modern demonstrator design, while a JoWo #6 steel nib finished in black PVD delivers smooth, dependable writing performance with a sleek, contemporary look.
This pen features Opus 88’s signature eyedropper filling system, offering an exceptionally large ink capacity. To fill, simply unscrew the grip section, use the included pipette to add ink, and reassemble the pen. Before writing, the rear blind cap must be loosened to open the internal valve. This shut-off valve system allows you to control ink flow—open it for extended writing sessions and close it when traveling or storing the pen—providing both convenience and peace of mind in everyday use.
Color: Blue
Trim: Gun metal
Filling System: Eyedropper
Nib: Extra Fine, Fine, Medium, Broad or Stub 1.5
Nib Material: Steel
The Opus 88 Demonstrator Mocha Mousse fountain pen is a bold and thoughtfully engineered writing instrument designed for writers who appreciate both capacity and control. This large, non-postable pen features an eyedropper filling system, offering exceptional ink capacity while minimizing leaks during travel or storage. It is fitted with a black stainless steel #6 JoWo nib for smooth, dependable performance and includes a glass eyedropper for easy filling with your favorite fountain pen ink.
Finished in a warm, café-inspired palette, the Mocha Mousse design pairs an opaque light brown cap and barrel with translucent dark brown finials, creating a visually rich yet understated look. This colorway is a limited edition for 2025, making it a distinctive addition to any collection. An ebonite piston and rubber gasket seal the ink chamber when fully closed, preventing burping and leakage. Simply unscrew the blind cap and slightly loosen the rear rod to open ink flow to the feed. For extended writing sessions, leaving the valve open allows you to fully enjoy the pen’s impressive ink capacity and uninterrupted writing experience.
Color: Brown
Trim: Gun metal
Filling System: Eyedropper
Nib: Fine, Medium, or Broad
Nib Material: Steel, black