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Home Gravitas Special Ed from Kyuseido - Kakari FS Machine Blue
GravitasSKU:

Gravitas Special Ed from Kyuseido - Kakari FS Machine Blue

€575,00 /
Tax not included. Shipping calculated at checkout.
5.0 (30 reviews)
Nib: 14k Gold
Nib Size: Fine
Gravitas Special Ed from Kyuseido - Kakari FS Machine Blue
€575,00 /
Nib: 14k Gold
Nib Size: Fine

 
 
Description

Born from a collaborative effort from Kyuseido and Ben Walsh Design, the Kyuseido - Kakari FS features the innovative Pump Piston Filler integrated filling system. Unmatched attention to detail defines the Kyuseido Kakari FS. The pen body is made with optical grade cast acrylic, chosen for its remarkable clarity and beautiful polish, and internally fit with 303 stainless steel piston unit and rod that forms the Pump Piston Filler.

The cap, section, and piston knob are made from Ti-6Al-4V and finished with a high Ra finish directly on a Swiss lathe. The internal lining in both the cap and the piston knob are made from Delrin(r) acetal homopolymer, which ensures the smooth sensation when capping and uncapping the pen.

The piston rod features a valve system which blocks off the main ink chamber of the barrel from the nib and feed of the pen and can minimize potential leakage when traveling. To allow unrestricted ink flow from the barrel into the feed, unscrew the piston knob until the piston rod can move freely before writing.

Kyuseido worked with Ben Walsh Design to create two special finishes, only available through Gravitas Pens, to commemorate the release of this pen. The Kyuseido Kakari FS Gravitas Pens Special Edition comes in matte blue or machine polished blue.

These Gravitas Pens Special Editions will feature 14k yellow gold nibs fit on an ebonite feed made from black Nikko ebonite and adorned with the distinctive Gravitas Pens logo. The premium and durable AM tipping is specially formulated for high performance.

Please note that the nib sizes for the Gravitas Pens Special Editions write larger in size than the nibs from Kyuseido. Additionally, the Gravitas Pens nibs and feeds are set further into the housing than those from Kyuseido.

While it is possible to remove the section and to disassemble the Kyuseido Kakari FS, any disassembly is “at the user’s risk” and damage caused due to disassembly is not covered by the Kyuseido International Warranty.

The Kyuseido Kakari FS is a robust pen built to last. However, it is not designed to be indestructible. Damage caused due to dropping the pen, handling with excess force, and other external factors beyond regular writing and operation can be repaired outside of the Kyuseido International Warranty for a fee.

The Kyuseido Kakari is available in machine finish (shiny) only.

Specifications:

- brand: Gravitas
- type: Fountain Pen
- color: Blue, Silver, Gold
- body material: titanium, stainless steel, delrin
- cap type: Screw-cap
- filling mechanism: Pump Piston Filler
- nib material: 14k Gold
- nib size: Extra Fine, Fine, Medium, Broad, Double Broad
- postable: Yes
- trim: Blue color
- length overall (closed): 144 mm
- length overall (posted): 175  mm
- body length: 133 mm
- cap length: 62 mm
- body diameter: 14 mm
- cap diameter (without clip): 14 mm
- weight (overall): 46.6 grams
- body weight: 30.8 grams
- cap weight: 5.8 grams

Specifications

Brand: Gravitas
Model: Kakari
Edition:
Color: Blue
Body Material: Metal and Acrylic
Finish:

Cap Type:
Screw
Filling Mechanism:
Hybrid
Postable:
Yes
Trim Color:
Length Overall (Closed): 144 mm
Length Overall (Posted): 175 mm
Body Length (Uncapped):
133 mm
Body Diameter: 14 mm
Cap Diameter (Without Clip): 14 mm
Weight Overall: 46.6 g
Body Weight: 30.8 g

Customer Reviews

Based on 30 reviews
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93.1
100.0
C
C.B.
Incredibly smooth.

I have a relatively small collection of fountain pens and had finally decided to get one with a gold nib. No matter how many different pens I looked at, I found myself coming back to this one time and time again. So I decided to go ahead and get myself a Kakari.

The one word that really ties everything together is smooth. From the finish to the threads and filling system to the absolutely wonderful nib, it's even better than I had hoped for. I opted for the Medium nib and it is a pleasure to write with.

This is also my first Gravitas pen, and it's every bit as amazing as I had expected from all of the reviews I had seen. Thank you to everyone at Gravitas and Pen Venture for such a wonderful writing instrument.

C
Christian C.
Finally an introduction

I started using fountain pens earlier this year to commemorate a promotion to a new station. Only upon receiving this pen hours ago and putting nib to page do I realize that I haven't experienced fountain pens until today. I've been researching and admiring this pen since August, and from its substantial weight, level of feedback, and build quality to its unique filling mechanism, it shattered my expectations.

I regret only that I did not decide to buy this pen earlier.

Kudos to Ben Walsh, Cy, and Emy for the utterly fantastic quality and tuning of this instrument. For anyone considering this pen, there is no reason to hesitate. It seems I'm now one of many who are happy to have trusted Emy and the Pen Venture team!

D
Dan Shapiro
Wonderful nib on Kakari

I find the most wondrous things about the matte blue is the exceptionally smooth, and also wet nib that I asked Emy to tune. The F nib writes like an excellent medium nib - just the way I like. The matte blue finish is lovely, and the excellent construction and "feel" to the pen are terrific. But to me what makes this pen more exceptional than the Monster pens (which I also have), plus the Titan, is the lovely nib. I wish Emy and Ben would offer this nib on some of their other pens, even if a number 6 rather than an 8 on the Monster (and Titan pens).

Y
Yiannis Louizos
Tuned to Perfection

To keep it short - any high end pen I plan to get in the future I’ll look here first because the nib tuning/ check before shipment is the best I’ve experienced.

K
Ken Chien
Yet another wonderful and beautiful Gravitas pen!

After multiple carbon fiber (piston black, dinky, pocket) I had my eyes on this Kakari. Knowing that Emy would take the best care and possibly even personal tune the pen if I’m lucky I pulled the plug. And I am so happy with this absolutely gorgeous pen. The build and finish (I got the satin finish) were impeccable - and sturdy. Knowing the size ran bigger for this pen nib, I still went for the B and its writes just as juicy as I had hope it would. I personally love juicy pens and ink shading, so I am overjoyed with the performance. And I can’t stop admiring the craftsmanship of this (and other Gravitas) pen. I’m in love with this pen…it looks so gorgeous all inked up (I used Sailor Shikiori Yuki-Usagi, snow rabbit - a dark blue/gray shading). Thank you Emy and Penventure for yet another wonderfully satisfying purchase!

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© 2026 Pen Venture - Passion Virtuous,

★ Reviews

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857 reviews
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A
Gravitas - Vac 2.0 Aluminium | Black
Andreas Andersson
Substantial, reliable, and smooth

The Gravitas Vac 2.0 is an amazing tool for handwriting. The nib is smooth, distinct, and reliable, and it has some weight due to its durable materials, black aluminium/aluminum and ultem, the perfect combination of a tool which will survive most of us, still functioning if the internal vacuum piston system is cared for. I have enjoyed this fountain pen for seven days and I am pleased to say it is one of my better ones, and it is fun to use. I recommend it.

(Emy was correct: The nib has great flow, about six drops of ink will automatically flow from the nib after I have just filled it, after that no problems; tissue paper or the ink bottle under the nib until that happens is recommended, other than that: an excellent fountain pen.)

D
Tombow - Mono Sand 512B | Ink Eraser
Dan Shapiro
Mono sand combo eraser

This is good. It erases well

N
Gravitas - Vac 2.0 Aluminium | Black
Nabil Zouari
FANTASTIC !!!!!

What a fantastic pen—and customized too!

It writes beautifully and arrived surprisingly quickly, even though I’m in Canada. This is my third order from Pen Venture, and once again, the experience has been outstanding. It's always a pleasure to come back.

My Gravitas arrived perfectly tuned and was ready to write straight out of the box. I filled it with Pelikan Royal Blue, and from the very first stroke, it was smooth, consistent, and an absolute joy to use.

I own several excellent fountain pens, including a Pilot Custom 823, a Sailor 1911, and a Leonardo Momento Zero, and I can honestly say that this Gravitas holds its own among them. It is remarkably well made and comes very close to being the perfect writing instrument.

A big thank you to the entire Pen Venture team for the exceptional service, careful tuning, and attention to detail. I’m already looking forward to my next order!

C
Gravitas - Vac 2.0 Aluminium | Black
Cosmin R.
A Worthy Sequel to an Awesome Pen

On its own, this pen feels very durable and premium, and the bead-blasted, matte black coated treatment gives it a very “professional” vibe. The Fine nib is bouncy and smooth, very usable on the underside as well (with added feedback, but not scratchy), the ribbed steel grip is very comfortable, the feed holds a lot of ink on its own, and the reservoirs behind it will keep it in writing condition for dozens upon dozens of pages after a fill.

The cap screws open and closed smoothly, with a very satisfying click at the end when closed; it posts deeply, and it also posts securely after being pressed down slightly on the barrel. It is light enough that it does not back-weight the pen significantly when posted.

The barrel construction, along with the newly-implemented Kraken filling system, ensure a significant amount of ink is pulled in from the first try. Much like the main cap, the blind-cap screws open and closed smoothly for refills or ink transfers between reservoirs.

Compared to its predecessor:
Fewer transparent areas overall, but the Vac 2.0’s structure feels more solid than the Ultemate Vac.
The body thickness and thread profiles are different on the Vac 2.0 than on the Ultemate Vac, no mix-and-match potential here.
The matte black coating gives the pen a more refined, premium feel on the metallic parts.
The inner lining of the cap doesn’t get stuck in the barrel thread as often, and when it does, it either slips back into correct position, or it is easier to unscrew and reposition, without the metal thread eating into the cap material.
The coated, no-breather-hole design of the new Gravitas steel nib may not be to everyone’s taste, but I like it a lot, and functionally, this nib feels more bouncy and polished, with smoother writing than its predecessor.
The feed seems to pick up a lot more ink on its own from just a 5-second dip, and the small reservoir behind it looks to have more capacity to back it up before needing to unscrew the blind cap and refill it from the large reservoir.
The Kraken filling system seems to suck up significantly more ink per pump than the mechanism from the Ultemate Vac.

Overall, a very well made fountain pen, and a thorough refinement to an already excellent design. Very satisfied with this purchase!

User picture User picture
K
Gravitas - Vac 2.0 Aluminium | Black
Keith Schumacker
Great Little Monster

Wow!
Just like the Monster but thinner. For me it is more comfortable for longer writing sessions. The filling system is stellar. Holds lots of ink. As always Ben Walsh and Emy have delivered a innovative and enjoyable writing experience. Can't wait to see what's next. Keep up the wonderful work!

123
Review picture
Cosmin R.
A Worthy Sequel to an Awesome Pen

On its own, this pen feels very durable and premium, and the bead-blasted, matte black coated treatment gives it a very “professional” vibe. The Fine nib is bouncy and smooth, very usable on the underside as well (with added feedback, but not scratchy), the ribbed steel grip is very comfortable, the feed holds a lot of ink on its own, and the reservoirs behind it will keep it in writing condition for dozens upon dozens of pages after a fill.

The cap screws open and closed smoothly, with a very satisfying click at the end when closed; it posts deeply, and it also posts securely after being pressed down slightly on the barrel. It is light enough that it does not back-weight the pen significantly when posted.

The barrel construction, along with the newly-implemented Kraken filling system, ensure a significant amount of ink is pulled in from the first try. Much like the main cap, the blind-cap screws open and closed smoothly for refills or ink transfers between reservoirs.

Compared to its predecessor:
Fewer transparent areas overall, but the Vac 2.0’s structure feels more solid than the Ultemate Vac.
The body thickness and thread profiles are different on the Vac 2.0 than on the Ultemate Vac, no mix-and-match potential here.
The matte black coating gives the pen a more refined, premium feel on the metallic parts.
The inner lining of the cap doesn’t get stuck in the barrel thread as often, and when it does, it either slips back into correct position, or it is easier to unscrew and reposition, without the metal thread eating into the cap material.
The coated, no-breather-hole design of the new Gravitas steel nib may not be to everyone’s taste, but I like it a lot, and functionally, this nib feels more bouncy and polished, with smoother writing than its predecessor.
The feed seems to pick up a lot more ink on its own from just a 5-second dip, and the small reservoir behind it looks to have more capacity to back it up before needing to unscrew the blind cap and refill it from the large reservoir.
The Kraken filling system seems to suck up significantly more ink per pump than the mechanism from the Ultemate Vac.

Overall, a very well made fountain pen, and a thorough refinement to an already excellent design. Very satisfied with this purchase!

Gravitas - Vac 2.0 Aluminium | Black