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TWSBI Diamond 540
For the last two weeks, I’ve been testing the TWSBI Diamond 540 inked with Noodler’s Blue. I tested both fine and medium nibs.
Grade: A-
This is a crisp, cleanly designed demonstrator with a piston fill mechanism. It writes extremely wet. With Noodler’s Blue there was a lot of feathering on cheap paper. On higher quality paper, it delivered a deep saturated wet line.
The pen is big. Bigger than a Lamy Safari. It’s made of polycarbonate, so it’s not too heavy.
The nib is exposed and writes a size up. A fine writes like a medium, and a medium like a broad. In both sizes that I tested, the nib was super smooth.
The piston filler holds a ton of ink. I’ve never had a fountain pen which held as much ink as this pen.
I totally enjoyed this pen. It’ll go into my daily rotation.
Two weaknesses that you should know. First, the grip is make of clear polycarb like the rest of the pen and is slippery. Second, it has a screw cap which I don’t like. The threads don’t allow proper posting of the cab.
