Name: Nautiko | Black Open Movement
Brand: My Store
Price: 279.99 EUR
Availability: InStock

39mm

41mm

Nautiko | Black Open Movement

€279,99

€349,99

Key Design Features

Dial: Black horizontal-striped dial with open-heart aperture
Open-heart: Positioned at ~9 o’clock, exposing the balance wheel
Indices: Applied silver baton hour markers
Hands: Polished silver baton hands with lume
Seconds hand: Slim central seconds
Logo: Seiko at 12 o’clock
Bezel: Rounded octagonal stainless-steel bezel with brushed finish
Bracelet: Integrated stainless-steel bracelet with brushed links and polished accents

Case & Build

Case size: ~39–41 mm
Thickness: ~11.5–12 mm (slightly thicker due to open-heart movement)
Material: 316L stainless steel
Finish: Predominantly brushed with subtle polished edges
Crown: Push-pull crown
Caseback: Exhibition caseback (typical for open-heart automatics)

Movement

Movement: Seiko automatic open-heart (4R39 / related 4R series)
Functions:
– Hours
– Minutes
– Central seconds
– Open-heart display
Hacking: Yes
Hand-winding: Yes
Power reserve: ~41 hours
Frequency: 21,600 bph (3 Hz)

Crystal & Resistance

Crystal: Sapphire crystal
Water resistance: 10 ATM (100 m)

Built for Daily Wear

Express Shipping

30-Day Returns

2 Year Warranty

30-Day Returns

2 Year Warranty

Free Express Shipping

Built for Daily Wear

Serious workmanship. Every detail considered.

At Malvori, nothing is rushed or pulled from a production line. Each watch is assembled and finished individually, using carefully selected components and precise tolerances to ensure balance, durability, and a deliberate feel on the wrist.

Serious workmanship. Every detail considered.

At Malvori, nothing is rushed or pulled from a production line. Each watch is assembled and finished individually, using carefully selected components and precise tolerances to ensure balance, durability, and a deliberate feel on the wrist.

Precision components
engineered for performance

From case dimensions to bracelet tolerances, every Malvori watch is built with carefully specified components designed to deliver balance, durability, and a refined mechanical feel on the wrist.

Precision components
engineered for performance

From case dimensions to bracelet tolerances, every Malvori watch is built with carefully specified components designed to deliver balance, durability, and a refined mechanical feel on the wrist.

30-Day Returns

Wear the watch and see how it fits your day-to-day.
If it’s not the right one for you, return it within 30 days for a full refund.

Every Malvori timepiece is built to be worn — and we want you to be certain about keeping it.

Frequently asked questions

We've gathered answers to the questions our customers ask most. Still need help? Our support team is here for you, just reach out through email

01 What is a Seiko Mod?

A Seiko mod is a customized watch built using genuine Seiko movements (like the NH35) combined with high-quality aftermarket components. We handcraft each timepiece with authentic Seiko NH35 movements and premium parts including 316L stainless steel cases, sapphire crystals, and ceramic bezels.

02 Do you provide tools to adjust the strap?

Yes, every watch comes with the necessary tools to adjust the bracelet or strap to fit your wrist perfectly.

03 How long does delivery take?

Since each watch is built to order, production takes 7-15 business days. Shipping is free worldwide, and all import duties and taxes are included in the price.

04 Can you remove the Seiko logo?

Absolutely! Simply add the desired watch to your cart and include a note in the cart section saying:"No Seiko logo".We'll take care of the rest.

05 Can I customize my watch? Absolutely!

We're committed to turning your dream watch into reality. Customize every detail, from the dial and hands to the case and strap, to create a timepiece that perfectly matches your style.

Craft your dream watch with our expertise. Write us to start designing!

06 Do they have any type of warranty?

Yes,All our watches come with a 2-years warranty covering any manufacturing defects,particularly in the movement,to ensure optimal performance.

If you experience any functionality issues or other problems,please contact us

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Seitona | Silver Universe

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SATISFIED OR REFUNDED

30-Day Return Policy

Based in spain

Handbuilt by our experts watchmakers

Free Delivery

In Spain and worldwide

Premium Quality

Highest standards

CONTACT US

Malvoriwatches@gmail.com

IMPORTANT LINKS

About Seiko Mods

No Brand Affiliation

Warranty Policy

Policies

Watch Care

MALVORI'S LUXURY WATCHES

At Malvori, we design custom watches that embody craftsmanship, elegance, and your unique style. Every timepiece is created by expert artisans using high-grade materials, ensuring exceptional quality in every detail. Elevate your look with Malvori and enjoy a watch crafted exclusively for those who appreciate true sophistication.

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Company

Shop

Help

Visit

261 NW 26th Street Miami. FL 33127

999-999-999

support@gmail.com

FREE DELIVERY

In Spain and Worldwide

SATISFIED OR REFUNED

30-Day Return Policy

BASED IN SPAIN

Handbuilt by our expert watchmakers

Premium Quality

Highest Standards

Contact Us

Malvoriwatches@gmail.com

IMPORTANT LINKS

No Brand Affiliation

About Seiko Mods

Warranty Policy

Watch Care

Policies

MALVORIS LUXURY WATCHES

At Malvori, we design custom watches that embody craftsmanship, elegance, and your unique style. Every timepiece is created by expert artisans using high-grade materials, ensuring exceptional quality in every detail. Elevate your look with Malvori and enjoy a watch crafted exclusively for those who appreciate true sophistication.