We don't get many Onoto de la Rue pens on this site. This old black hard rubber pen is a bit of a mystery. We think this vintage pen has an early version of the plunger vacuum filler...similar to what Sheaffer began using in its Vac-fil technology. Our pen is unrestored and not working to fill the pen. No cracks nor deep scratches. Lots of wear from use. The pin strips on the cap and barrel are mostly gone. The two decorative bands on this pen are solid 18k gold. We dipped the 14k gold nib and found it just barely counts as a semi-flex nib working from extra fine to about broad. Don't smush the slip cap on too hard because you will break the slightly too long nib. Click the headline for close-ups. 14.5cm capped.