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The TWSBI Diamond 580AL fountain pen is available in two varieties, both basically of demonstrator format. The original version had a chromed aluminium section and pump mechanism, but TWSBI have since produced another variant in which these parts are in a beautiful rose-coloured satin-finish aluminium.

In both variants of the TWSBI 580 AL fountain pen, the accompaniments are of chrome, comprising the cap finial, clip, cap band, section end and pump ring. The cap has the TWSBI logo on the finial, and the company's initials around the cap band.

Although the cap of the TWSBI 580 AL will post, we suspect that most people won't do so; the posted length is exceptional, and since the cap isn't far off half the weight of the complete pen, many may find it unwieldy.

This manufacturer does demonstrators very well, and the TWSBI Diamond 580 AL fountain pen is no exception. The cap and barrel of the pen are completely transparent, revealing the pump-action filler clearly. The clear barrel also enables you to see how much ink you have left at a glance, so you will never have the pen run dry on you in an emergency! The lower end of the barrel, just above the screw-thread, features a rubbery (plastic) O-ring that forms an air-tight seal to keep the nib and section moist when not in use.

The cap of the TWSBI Diamond 580AL is a screw fit (as with all TWSBIs) that takes only 1¼ turns to remove, so the pen is quickly available, and is is of cap-over-pen format so that there isn't a large step down from the barrel to the section.

The "Diamond" part of the TWSBI Diamond 580AL fountain pen's name comes from the multi-faceted barrel that (within limits, obviously) ensures that pen will not roll away if left uncapped on a desk. Capped, the clip obviously prevents the pen heading towards the edge of the desk and nib-oblivion on the floor.

The TWSBI 580AL is fitted with a beautiful Jowo polished steel nib engraved with TWSBI logo and branding, available in Extra-Fine, Fine, Medium, Broad, Stub 1.1mm and (at an extra cost) Stub 1.5mm, the latter being available only on 580s and 580ALs.

Write Here are pleased to be able to offer the TWSBI Diamond 580AL for sale online, or from our shop on the High Street in Shrewsbury, UK, where you can visit us to see the full range of TWSBI's pens. If you buy online, we can normally send you your desired pen by return of post provided we receive the order before 3.00pm, UK time.

Details: TWSBI Diamond 580AL Fountain pen

Length (Capped): 143mm
Length (Uncapped): 131mm
Length (Posted): 179mm

Diameter (Cap Band): 15mm
Diameter (Barrel): 13mm
Diameter (Section): 9.5mm

Weight (Capped, empty): 30g
Weight (Uncapped, empty): 17g
Weight (Cap): 13g

Refill: Bottled ink, using screw-action plunger, up to ~2.5ml capacity.