The TWSBI Diamond 580ALR demonstrator fountain pen showcases precision mechanical engineering with modern minimalist aesthetics. Its transparent faceted barrel reveals the internal piston-fill mechanism, allowing full visibility of the ink reservoir. Matte grey ribbed aluminum accents on the section, connector, and piston assembly provide refined tactile balance. Equipped with a branded Extra Fine (EF) stainless steel nib, this pen delivers crisp and consistent line work. The cap secures via smooth threading and displays the polished clip alongside the distinctive red finial emblem.
CONDITION & DETAILS
Brand: TWSBI
Status: Pre-Owned | Condition: Very Good
Condition Notes: Light surface handling marks on resin barrel and cap, with residual green ink present in the demonstrator reservoir.
Visible Flaws: Residual green ink inside the reservoir chamber and on feed; light handling marks.
Measurements: Approx. 5.6 in length capped, 0.6 in cap diameter
Inclusions: Presentation Case, Outer Box
Item: Fountain Pen | Size: EF
Color: Clear | Secondary: Grey | Interior: Green | Hardware: Silver-Tone
Material: Resin
Closure: Screw Cap | Features: Extra Fine (EF) nib, integrated piston-filling mechanism, clear demonstrator barrel, ribbed aluminum grip section, threaded cap, pocket clip, red logo finial
Please review all photographs; they form part of the condition description.





























Reviews
There are no reviews yet.