Manufactured by Thomas De La Rue & Co. Ltd. in London, the Onoto 6000 is an elite, extraordinarily long signature pen that represents the absolute zenith of golden-age British fountain pen engineering. Emerging around 1925, the 6000 was concurrently produced in two distinct configurations: the “Standard” version (featuring a classic stepped section) and the “Streamline” version (noted for its elongated, tapered gripping section).

Highly revered by advanced vintage collectors, the Onoto 6000 is famous for its imposing length—stretching to a colossal 193 mm (7.5 inches) when posted—making it an incredibly elegant, authoritative desktop writing instrument.

### BCHR Engineering & The Famous Shut-Off Valve

Dating from an era when De La Rue dominated the premium empire market, the 6000 showcases incredibly tight manufacturing tolerances:

**The Black Chased Celluloid Body:** Unlike early 1920s Onotos lathed from vulcanized hard rubber (which rapidly oxidized to brown in sunlight), this pen is precision-machined from early black celluloid. It is deeply embellished with a crisp, geometric chasing pattern (engine-turning), allowing it to retain a glossy, deep jet-black hue without the discoloration risk of hard rubber.

**The High-Vacuum Plunger Filler:** Unlike soft rubber sac-fillers of the 1920s that rapidly degraded, Onoto utilized a bulletproof, high-capacity mechanical plunger filling system. One single downward stroke of the internal rod compresses the air and pulls an immense volume of ink directly into the ebonite barrel.

### The Celebrated Onoto No. 3 14ct Gold Flex Nib

* **The Writing Unit:** The pen is equipped with a factory-correct Onoto 14ct Solid Gold No. 3 Nib, structurally designed to work with De La Rue’s early primitive hand-grooved ebonite feeds.

* **The Legendary Responsiveness:** These interwar British nibs are universally celebrated by calligraphers for their spectacular expressive flex character. With minimal variation in hand pressure, the tines spread wide to transition smoothly from an elegant fine line to a thick, juicy broad stroke, adding tremendous historical flourish to signature work.

This pen is a rare eyedropper version and in amazing condition with crisp guilloche and stamping, helped no doubt by being celluloid and not ebonite. It retains its black colour like new and the medium nib is superb. Very smooth and springy with the capacity to flex to BBB if desired.

### Technical Specifications

* **Manufacturer:** Thomas De La Rue & Co. Ltd. (London, UK)

* **Model:** Onoto 6000 Series

* **Era:** Late 1920s / 1930s

* **Material:** Premium Black Chased Celluloid

* **Filling System:** High-Capacity Eyedropper

* **Cap Style:** Screw-on Cap (Clipless)

* **Nib:** Factory-Correct Onoto number 3 14ct Solid Gold

* **Nib Size:** Medium Flex

* **Feed:** Hand-Channeled Ebonite

* **Length (Capped):** ~147 mm to 150 mm