TWSBI Diamond 580 RBT Fountain Pen
The TWSBI Diamond 580 RBT has the same diamond faceted barrel (designed to prevent rolling), nib and mechanism as the original Diamond 580 but with the added bonus of two colours on either end, red and blue. Hence the name RBT. The transparent barrel TWSBI are know for it still present revealing the piston filling mechanism inside.
Has the same nib sizes of extra fine, fine, medium, broad and stub 1.1mm.
TWSBI Diamond 580 RBT fountain pen
Length (capped): 143mm Length (uncapped): 130mm Length (posted): 176mm
Diameter (cap): 15mm Diameter (barrel): 13mm Diameter (grip): 10mm
Weight (capped, empty): 27g Weight (uncapped, empty): 14g Weight (cap): 13g
Refill: Twist-action plunger, holding ~3ml ink.