Gravitas Sentry Ultem Fountain Pen

Gravitas is an Irish pen brand known for their bold design, precision engineering, and unique materials. Machined from solid metals or other hardy materials and thoroughly tested for durability, each pen offers a striking balance of form, function, and fun
Item #: 277217
Our Price: $141.60
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Product Description

Gravitas Sentry Ultem Fountain Pen

Introducing the Sentry fountain pen, the larger sibling of Gravitas' entry-level model. While slightly heavier than its counterpart, the Sentry remains comfortable and user-friendly, thanks to its balanced, weighted section. The cap, equipped with triple-start threads, disengages effortlessly with just 2.25 turns.

Machined from a solid rod of medical grade Ultem, known for its strength and durability, this material can withstand significant impact without cracking or breaking. Despite its strength, Ultem is lightweight compared to materials and heat resistant. With a satin/frosted texture it shows the inner works of the Sentry and when is converted to an eyedropper shows the ink color in a unique way.

Measuring 25mm in length and tapering from 13.25mm to 11.5mm in width, the section is expertly crafted from 304 stainless steel, with a black PvD color and adorned with micro-machined grooves for a secure hold during every writing session. The Sentry is equipped with a Gravitas-produced black size 6 steel nib, compatible* with Jowo No. 6 threads, and an ABS plastic feeder, offering a range of nib options including Extra Fine, Fine and Medium. To further enhance your experience, each Sentry fountain pen comes with a standard international converter.

Elevate your writing journey with the exceptional craftsmanship of the Sentry fountain pen.

Review: James Submitted: 1/26/2026

Quality2 out of 5 stars.

verified

Subject

Ultem is very cool, but...

I really like this pen. Ultem is such a terrific material. The pen has a great weight, it feels really good in my hand. I really like the metal section. It balances the lightness of the pen very well. The size is very comfortable for my large hand. BUT! The nib is TERRIBLE! I bought it with a fine nib. The tines of the nib were jammed together. It wrote very scratchy, and skipped a lot. I tried teasing the tines apart with a .002 inch spacer. I tried carefully pressing the nib against a hard surface. I adjusted the seating of the nib in the feed. I tried different inks. It's improved, but still a very unpleasant writing experience. I guess I will try replacing the nib with a standard Jowo nib to see if that improves it. I really want to love this pen. Hopefully a new nib will fix things.
Merchant Response

Review: Emily Submitted: 1/23/2026

Quality5 out of 5 stars.

verified

Subject

It's good reliable writer

I like this pen because it is sturdy, well-designed, and the nib writes smoothly and consistently.
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Customer Comments
"Heavy but well-balanced. Firm and smooth nib. Quality is very good. This pen is sturdy and well machined. All the parts fit very well." - Verified Buyer, December 2025