TWSBI Diamond 580, a classic fountain pen with a piston ink-filling system.
The Diamond 580 comes with a benchmark ink-filling mechanism and has all detachable parts. We felt that it was important to allow the user to disassemble and reassemble the pen and completely experience the traditional aspects of owning and using a fountain pen.
Improved grip and end barrel section compared to 540
580 has increased ink capacity, about 30% more than 530
580 has improved the smoothness of cap thread turning.
New aluminium machined grip, connector, and piston rod.