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. New aluminium machine grip, connector and piston rod. 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 Purple 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
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I got this pen during the Pengallery event last March 2020. It's my first piston-filling pen and I use this one when traveling due to its ink capacity. I also like the fact that I can see the color this is a nice introductory pen if you're looking for piston-filler types without breaking the bank. It also comes with a tool if you need to disassemble it and the company also has good customer service.