TWSBI Eco Fountain Pen - Irish Green with Onyx

A deeper green that feels capable

The TWSBI Eco Irish Green takes the reliable Eco platform and shifts the mood completely. The darker green resin and black Onyx trim give it a more grounded, mature feel, somewhere between forest green and old drafting tools. Still the same dependable piston filler underneath, just with a colour way that feels more focused and composed.

What sets it apart

• Dark Irish green with black trim for a more mature feel
• Reliable piston filler with high ink capacity for long writing sessions
• Crystal clear barrel lets you keep track of ink level and movement
• Smooth steel nib that handles fast everyday writing well
• Feels more understated than brighter Eco colour ways

Feel in the hand

It gets out of the way once you start writing. The darker green and black trim make the pen feel calmer and more focused than the brighter Ecos, especially when paired with earthy inks or cream paper.

Who it’s for

• You want a daily writer with more visual depth 
• You like pens that feel slightly more serious without a premium price
• You enjoy using bottled ink and seeing the mechanics of the pen
• You prefer grounded, natural colour ways over bright styles
• Teachers who use green inks for marking

Not for

• You want a compact pocket pen
• You dislike even basic fountain pen maintenance
• You prefer bright colours or highly expressive designs
• You want a completely opaque pen body

Practical tips

• Use it with the cap unposted for best balance

FAQs

Is the Irish Green very bright?
No, it’s a deeper, more muted green with a natural tone

Is the Onyx trim just cosmetic?
Yes, but it meaningfully changes the feel, making it more grounded and less reflective

Is it good for beginners?
Yes. It’s one of the most forgiving piston fillers in its category

Does it require special maintenance?
Only basic flushing with water. Full disassembly is only required occasional to regrease the piston if it becomes stiff

What’s included

• TWSBI Eco Fountain Pen Irish Green with Onyx
  
• Wrench
• Silicone grease
• Instruction leaflet
• Free nib tuning from LarryPOST

Ink pairing suggestions

• Deep greens to bring out the natural tone
• Blue-black inks to make it more formal 
• Warm browns to create a strong contrast against the green body

Build your practice

• The Eco plated series work well together as a collection
• A pen wrap is an easy way to hold multiple pens
  
• Use a notebook with smooth paper to handle the wet ink lay down

Specifications

• Brand: TWSBI
• Brand series: Eco
• Launch: Sept 2024
• Origin: Taiwan
• Nib: Black Stainless steel
• Nib sizes: EF, F, M, B, 1.1mm stub
• Filling system: Piston filler (1.8mL)
• Body: Transparent polycarbonate
• Cap: Twist
• Diametre: approx. 13mm
• Length: approx. 139mm (capped)
• Weight: approx. 21g (capped)
• Comparable size: Lamy Safari, Pilot Metropolitan