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New

Seikonaut Watch Case - 40mm

BUILD YOUR OWN WATCH.
ONLY 4 main components are needed to complete a watch.
Watch Case
Dial
Hands
Movement
Movement Holder (optional)
Tweezer (optional)

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.

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 black edition, visit here

Made exclusively for us with quality assurance by ISO 9001 Certified manufacturers.

FREE WORLDWIDE SHIPPING

Customer Reviews

Based on 31 reviews
97%
(30)
3%
(1)
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(0)
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D
D.C.
Using this mod part for: seikonaut

good and fast

J
J.S.
Using this mod part for: Seiko 5 snkk87
Its a stunner!

Fast shipping, great service. The Seikonaut is awesome! Alot of bang for the buck!🔥 As you can see on the pictures, I brushed the middlelinks on the bracelet.

N
N.w.
Using this mod part for: Aftermarket case
Winner!

Adriel wins. I have never had a better experience buying watch parts. The shipping was fast. Less than a week from the time I ordered, till the case was in my hands. The case quality and finishing is better than I expected. There was even a hand written thank you note in the box! This kind of service is truly the gold standard.

J
J.W.
Using this mod part for: Seikonaut
My first Seiko Mod

Super fast shipping to California! And I really love the look of the Seikonaut!

Thank you again!

I
I.c.
Using this mod part for: Seikonaut
high quality and fast shiping

I ordered siukonaut case, snowflake dial, nh38 movemnt and nautilus hands.. all came super fast and nicely done.
Thx

J
J.M.
Using this mod part for: Seikonaut
Insanely Good Value

This case is almost perfect (would like to see a bit more taper to the bracelet) and for the price cannot be beat. I ordered this fully assembled -- it was shipped quickly, well packaged, and is ticking away nicely on my wrist.

A
A.Z.
Using this mod part for: NH36
Great case!

Very solid and massive and beautiful case and bracelet.
I'd prefer fully brushed but some polish is not a problem at all.

동.이.
Using this mod part for: aftermaket cases
Nice Case!

Very good quality for the price!

P
P.B.
Using this mod part for: Aftermarket Cases
Seikonaut (Fully Assembled)

Ordered a fully assembled Seikonaut with a NH38, Nautilus hands, and a open heart Stardust dial. Shipping and processing were fast, got to the US in around a week.

In terms of the case, I was pleasantly surprised that the proportions were great (photos don’t do it justice), but if I am to be pedantic, there was unfortunately a minor scratch near the bottom of the topmost center link. Besides that, no other issues of note, and I’m really pleased with the quality of the finishing and parts.

P.S. it’s not explicitly mentioned anywhere, but the bracelet links are screw-based.

B
B.H.
Seikonaut

Bought a fully assembled seikonaut, case and parts quality is excellent! Fast shipping! Very happy with my purchase!