TWSBI Diamond 580 Iris Fountain Pen
Brand
TWSBIEra
post 1980Filling_System
piston fillerNib_Material
steelBody_Material
transparent resinRarity
commonKey Attributes
| Brand | TWSBI |
| Model | Diamond 580 Iris |
| Era | post-1980 |
| Filling System | piston-filler |
| Nib Material | steel |
| Nib Size | Extra Fine, Fine, Medium, Bold, Stub 1.1 |
| Body Material | transparent resin |
| Colorway | clear demonstrator with iris rainbow trim |
| Condition Grade | mint |
| Rarity | common |
About this Fountain pen
A modern TWSBI Diamond 580 demonstrator fountain pen with faceted transparent body and distinctive rainbow "Iris" trim. Collector interest centers on its clear piston-filling construction, angular diamond-cut barrel profile, and multicolor metal appointments.
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