- TWSBI believes that it is important to allow the user to disassemble and reassemble the pen and completely experience the traditional aspects of owning and using a fountain pen.
- Our ever-popular 580AL now with a matte finish, and subtle details on the grip and cap. New aluminium machined grip, connector, and piston rod.
- 580 has increased ink capacity, about 30% more than 530. 580 has improved the smoothness of cap thread turning.
- The TWSBI Diamond 580 is a classic fountain pen with a piston ink-filling system. By fusing the traditional mechanisms of the fountain pen with a modern industrial design, TWSBI has created an eye-catching fountain pen that is simultaneously appreciative of the past and relevant in the present.
- Filling System: Piston Filler
- Mechanism : Screw-cap
- Nib Colour: SilverItem
- Colour: Punch Pink, Emerald Green and Rose
- Collection: Diamond 580 AL

Twsbi Fountain Pen - Diamond (Broad 580 AL)
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