TWSBI Diamond 540 Mini
Key Attributes
| Brand | TWSBI |
| Model | Diamond 540 Mini |
| Era | post-1980 |
| Filling System | piston-filler |
| Nib Material | steel |
| Body Material | plastic |
| Colorway | clear demonstrator with silver trim |
| Rarity | common |
About this Fountain pen
A modern TWSBI Diamond Mini fountain pen with the brand's faceted transparent barrel design. This is a contemporary demonstrator-style pen rather than a vintage model, with collectible interest centered on its compact Diamond-series form.
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