Liberum Volucris Brass: Pocket Size, Vacuum Filling and Patina
Published · 3 min read (estimated)
Liberum Volucris Brass combines a brass body, clear ink window and vacuum filling in an approximately 120 mm capped fountain pen. Its listed weight is approximately 66 g in total and 42 g uncapped, making it the heavier of the two Volucris versions.
A brass finish that changes with handling
Brass develops patina with use. That changing surface is part of choosing this material, rather than a claim that every pen will develop the same colour or pattern. Consider both the appearance and the uncapped writing weight before ordering.
The brass product page includes close-up photographs and a dimension drawing. Use these to compare the pen with the grip and carrying space you prefer.
Bottled ink and the clear window
Volucris draws bottled fountain pen ink through a built-in vacuum filling mechanism. The clear window makes the supply visible. The filling system does not establish a specific capacity in millilitres, a fixed interval between refills or a guarantee against leaks.
Nib widths and compatible units
The standard installed #6 stainless steel nib uses a plastic feed, with EF, F, M and B options. The threaded housing has been confirmed by Liberum's assembly testing as compatible with JoWo #6 nib units. Check the complete unit before replacing components; size labels alone do not determine fit.
An optional ebonite-feed nib unit is supplied as one separate extra unit alongside the standard installed unit. It is not a second pen and is not a replacement for the default installed nib. The selected combination determines the price displayed on the product page.
Brass or titanium?
The titanium version is approximately 41.5 g in total and 28.4 g uncapped, with a green ink window. Both pens have the same listed capped length and filling type. Their different weights and surfaces are more useful selection criteria than an unsupported claim that one is the best material for everyone.
Next steps
- View the current brass pen and nib options
- Compare pocket fountain pens
- Learn about vacuum fillers
- Choose a fountain pen gift
For care, filling instructions or replacement-part questions, contact Liberum. The linked catalogue provides the measurements cited here.
About this guide: Published by Liberum, the seller of Volucris pens. AI tools assisted with drafting. Product facts are based on the linked catalogue and brand confirmations; this is not an independent hands-on review or a laboratory test. Photographs are supplied by the brand. Checked on 2 November 2026; specifications and available configurations can change.