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The TWSBI Diamond 580 is a piston-fill demonstrator fountain pen made by TWSBI (Taiwan, introduced 2012), distinguished by its faceted barrel design and availability with an italic nib for calligraphy.
8.35
Great
Why this score
Diamond 580 has strong fountain-pen consensus for build, capacity, and nib options; pricier than Eco but more refined.
Scoring methodology
2
The TWSBI Eco is a Taiwanese piston-fill fountain pen introduced by TWSBI (founded 2009 in Taichung) that offers a demonstrator body and italic stub nib at an accessible price point for lettering practice.
8.25
Great
Why this score
TWSBI Eco is widely praised for piston capacity and value; stub option is strong, though cracking concerns persist.
Scoring methodology
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