Your Cart is Empty

Seikonaut Watch Case (DLC BLACK EDITION) - 40mm

ONLY 4 main components are needed to complete a watch.
Watch Case
Rotor (optional)
Movement Holder (optional)
Tweezer (optional)


  • For a complete watch, select your (1) Dial, (2) Hands and (3) Movement.
  • To decorate movement, select your (4) Rotor (optional).
  • To have watch assembled, select (5) Assemble Watch. Please note that assembling the entire timepiece requires 2 to 5 business days prior to shipping.

Engineered by us and made exclusively for us with quality assurance by ISO 9001 Certified manufacturers.


From the iconic nautilus and Japanese Seiko comes the hybrid, Seikonaut.

Our own reinterpretation, every part, notches and crevices was redesigned from scratch. Creating a whole new allure and a refinement of the iconic design.

Now in DLC BLACK EDITION!! Every visible exterior of the watch case when worn is coated with black DLC. Right down to the little screws on the bracelets and joints.

What is DLC?
Diamond-like carbon (DLC) is a class of amorphous carbon material that displays some of the typical properties of diamond. As the name suggests, diamond-like-carbon means that the layer is as scratch-resistant as diamonds. DLC coating has 5 times the hardness of a 316L stainless steel. With DLC being harder than steel, this means that a DLC coated watch will have a very high resistance to scratches that you will not have to worry about scratching your watch. This coating will not disappear if you accidentally do something that would otherwise leave a huge mark on some PVD-method coated watches. A feature that is highly coveted by many watch enthusiasts.

This Seikonaut case comes complete with clear AR sapphire, sapphire caseback, screw down crown and solid brush and polished bracelet. Additionally, it has a water resistant of 200m.

Designed to fit all of our dials (28.5mm) and original NH movements (grey dial holding spacer).

**Please note that assemble watch option will assemble the entire timepiece ready for use and requires 2-5 business days prior to shipping.

For silver colour, visit here

Customer Reviews

Based on 10 reviews
Steve (Concord, US)
Top Tier Experience with LA

Excellent quality, fit and finish on the watch that Adriel built for me. I chose to combine the 40MM Seikonaut case with a Flieger Type A (Troposphere Pilot V2) no date dial and the Polished Black Pilot hands. Couldn't be happier with the result.

Thomas (Nice, FR)

De bonne qualité

Stokednaut (Aurora, US)
Using this mod part for: Seikonaut build, all Lucius Atelier parts
Exquisite case

The finish on this case is underrated and under sold. I was expecting nice but this is much nicer than some OEM watch cases I have. Fit I may as well not mention, everything is perfect. The finish is wonderful, the mix of polished and brushed surfaces is pleasing to the eye. The clasp has smooth, satisfying operation. The bracelet is not cheaply made it does not rattle or clink. Overall it is very well built and worth the expense, I highly recommend this case and bracelet to anyone looking for such a thing. 10/10

B.M.S. (Wuppertal, DE)
Using this mod part for: As much as i can ;)

The products and service here are the best! I am so happy. Thank you so much! Charlie gives it his seal of approval.

Agent47 (Sydney, AU)
10/10 Would Recommend

10/10 Would Recommend

Anonymous (Conroe, US)
Using this mod part for: Seikonaut Watch Case
Seikonaut Watch Case

Great case feels great weight wise and quality is good.

Inari_mod (Strasbourg, FR)
Perfect case

Case fit perfect very good quality

Anonymous (Thousand Oaks, US)
Using this mod part for: N/A
Great case!

I had Lucius Atelier build me a watch using this case and it came out great! The DLC is really high quality and built to last.

Tom D. (Ronse, BE)
Using this mod part for: Skx007
Nice case

Verre good quality case

Tylerz_mod (Le Raincy, FR)

Beautiful case, perfect proportion, easy to assemble!
The DLC coating give a real plus to this caseset.
I can only recommend this case ;-)