TWSBI Diamond 580AL Fountain Pen - Smoke Rose Gold IITWSBI Diamond 580, a classic fountain pen with a piston ink filling system. By fusing the traditional mechanisms of the fountain pen with a modern industrial design, we have created an eye catching fountain pen that is simultaneously appreciative of the past and relevant in the present. 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