TWSBI pens made by one of Taiwan's most experience pen maker who started out as a contract manufacturer. The Diamond features a clear demonstrator body with a piston filling mechanism; these attributes combined with its low price make for a very enticing pen. The body is made of a round clear plastic allowing you to see the internal piston mechanism and the feed. 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
This is a one time production color in Nickel Gray finish.
Length with cap close - 14.1cm
Length with cap posted - 17.5cm
Central circumference - 4.2cm
Sytem: Fountain pen uses Piston-filled ink.
Nib type: Steel nib