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TWSBI Diamond 580 Fountain Pen
TWSBI Diamond 580 Fountain Pen
£46.99
All about nib sizes
The upgraded replacement for the Diamond 540. Same size, same features but improved in many areas. Both front sections and barrel now feature trim rings for reinforcement. Also, the metal threaded part that held the piston mechanism has been deleted with the result that the barrel material is thicker and therefore stronger in this region. The TWSBI Diamond 580 features the same piston mechanism and huge 1.9cc ink capacity - the largest of any pen in this price range.

The Diamond 580 is virtually unique amongst fountain pens in that it can be completely disassembled by the user for cleaning and servicing and experienced users are encouraged to do so. Full servicing instructions are included with the pen as well as a small wrench to remove the piston mechanism and a bottle of silicone lubricant for the piston mechanism (download manual here).

Length capped = 142mm
Nib length = 18.2mm
Section length = 21mm
Section diameter (max/min) = 10.0/9.3mm
Barrel diameter (max) = 13.1mm
Total length (not posted, including nib) = 129mm
Total length posted (including nib) = 175mm
Weight = 29g
Nib material: stainless steel
Filling mechanism: piston