Hand assembled to order
Genuine Japanese movement
Individually inspected
BUY 2, GET 1 FREE
Automatically applied at checkout.
WELCOME OFFER
Use code NEW10 for 10% off your first order.
Logo:Seiko Logo
Free WW Shipping
Easy Returns
2-Year Warranty
Free Gift Included
Description
Specifications
2 Years Warranty
Return Policy
Custom Logo Information
What's Included
Description
The Seiko Mod Aquanaut Midnight Black Edition embodies contemporary sport-luxury with refined precision. Its bold black textured dial and luminous numerals ensure flawless readability in any light, while the brushed 316L stainless steel case and durable black rubber strap strike the perfect balance between strength and sophistication. Measuring 41mm, it commands attention with effortless comfort—equally suited for active pursuits or elegant occasions.
Powered by the trusted Seiko NH35 automatic movement, it delivers precision, reliability, and enduring performance rooted in Japanese craftsmanship. A sapphire crystal with anti-reflective coating, screw-down crown, and exhibition case back showcase its premium build. With luminous detailing, 3ATM water resistance, and a secure butterfly clasp, the Aquanaut Midnight Black Edition stands as a statement of confidence, individuality, and timeless design.
A reliable Japanese automatic movement featuring a date complication. The NH35 is one of the world's most trusted automatic watch movements, known for its durability, accuracy, manual winding capability, and hacking seconds. It is widely used in dive watches, sports watches, and everyday automatic timepieces.
The TMI NH35 is an automatic mechanical movement developed by TMI (Time Module Inc., part of the Seiko Group). Renowned for its reliability and ease of servicing, the NH35 combines automatic winding, manual winding, hacking seconds, and a quick-set date function, making it one of the most popular movements in modern watchmaking.
Specification
Details
Manufacturer
TMI (Seiko Group)
Caliber
NH35
Movement Type
Automatic with Manual Winding
Functions
Hours, Minutes, Seconds, Date
Jewels
24 Jewels
Beat Rate
21,600 BPH (3 Hz)
Power Reserve
Approx. 41 Hours
Diameter
27.40 mm
Height
5.32 mm
Accuracy
-20 / +40 seconds per day
Hacking Seconds
Yes
Country of Origin
Japan or Malaysia
Operating Instructions
Automatic Winding
The NH35 automatically winds itself through the natural movement of your wrist while worn.
Manual Winding
If the watch has stopped:
Turn the crown clockwise approximately 55 times to fully wind the mainspring.
The watch will continue winding automatically while being worn.
Setting the Time
Pull the crown to the second click.
Turn the crown until the correct time is displayed.
The second hand stops while setting the time for precise synchronization.
Push the crown back to the normal position.
Setting the Date
Pull the crown to the first click.
Turn the crown to adjust the date.
Push the crown back once the correct date is set.
Important: Do not change the date between 9:00 PM and 4:00 AM, as the calendar mechanism may be engaged.
Care & Maintenance
Wear the watch regularly to keep the movement wound.
If not worn for several days, manually wind before use.
Avoid strong magnetic fields and severe impacts.
Keep the crown fully pushed in (or screwed down if applicable).
Professional servicing is recommended every 5–7 years, depending on usage and environmental conditions.
Why Choose the NH35?
Genuine Japanese automatic movement
Reliable date complication
Manual winding capability
Hacking seconds for precise time setting
Approximately 41-hour power reserve
Durable and easy to service
One of the most trusted automatic movements in the watch industry
The TMI NH35 has earned its reputation as one of the most dependable automatic movements available. Its robust construction, proven reliability, and straightforward maintenance make it an excellent choice for everyday wear, dive watches, and sports watches alike.
Seiko TMI NH35 Manual
Automatic
A reliable Japanese automatic movement featuring a date complication. The NH35 is one of the world's most trusted automatic watch movements, known for its durability, accuracy, manual winding capability, and hacking seconds. It is widely used in dive watches, sports watches, and everyday automatic timepieces.
The TMI NH35 is an automatic mechanical movement developed by TMI (Time Module Inc., part of the Seiko Group). Renowned for its reliability and ease of servicing, the NH35 combines automatic winding, manual winding, hacking seconds, and a quick-set date function, making it one of the most popular movements in modern watchmaking.
Specification
Details
Manufacturer
TMI (Seiko Group)
Caliber
NH35
Movement Type
Automatic with Manual Winding
Functions
Hours, Minutes, Seconds, Date
Jewels
24 Jewels
Beat Rate
21,600 BPH (3 Hz)
Power Reserve
Approx. 41 Hours
Diameter
27.40 mm
Height
5.32 mm
Accuracy
-20 / +40 seconds per day
Hacking Seconds
Yes
Country of Origin
Japan or Malaysia
Operating Instructions
Automatic Winding
The NH35 automatically winds itself through the natural movement of your wrist while worn.
Manual Winding
If the watch has stopped:
Turn the crown clockwise approximately 55 times to fully wind the mainspring.
The watch will continue winding automatically while being worn.
Setting the Time
Pull the crown to the second click.
Turn the crown until the correct time is displayed.
The second hand stops while setting the time for precise synchronization.
Push the crown back to the normal position.
Setting the Date
Pull the crown to the first click.
Turn the crown to adjust the date.
Push the crown back once the correct date is set.
Important: Do not change the date between 9:00 PM and 4:00 AM, as the calendar mechanism may be engaged.
Care & Maintenance
Wear the watch regularly to keep the movement wound.
If not worn for several days, manually wind before use.
Avoid strong magnetic fields and severe impacts.
Keep the crown fully pushed in (or screwed down if applicable).
Professional servicing is recommended every 5–7 years, depending on usage and environmental conditions.
Why Choose the NH35?
Genuine Japanese automatic movement
Reliable date complication
Manual winding capability
Hacking seconds for precise time setting
Approximately 41-hour power reserve
Durable and easy to service
One of the most trusted automatic movements in the watch industry
The TMI NH35 has earned its reputation as one of the most dependable automatic movements available. Its robust construction, proven reliability, and straightforward maintenance make it an excellent choice for everyday wear, dive watches, and sports watches alike.
Hand assembled to order
Genuine Japanese movement
Individually inspected
BUY 2, GET 1 FREE
Automatically applied at checkout.
WELCOME OFFER
Use code NEW10 for 10% off your first order.
Logo:Seiko Logo
Free WW Shipping
Easy Returns
2-Year Warranty
Free Gift Included
Description
Specifications
2 Years Warranty
Return Policy
Custom Logo Information
What's Included
Description
The Seiko Mod Aquanaut Midnight Black Edition embodies contemporary sport-luxury with refined precision. Its bold black textured dial and luminous numerals ensure flawless readability in any light, while the brushed 316L stainless steel case and durable black rubber strap strike the perfect balance between strength and sophistication. Measuring 41mm, it commands attention with effortless comfort—equally suited for active pursuits or elegant occasions.
Powered by the trusted Seiko NH35 automatic movement, it delivers precision, reliability, and enduring performance rooted in Japanese craftsmanship. A sapphire crystal with anti-reflective coating, screw-down crown, and exhibition case back showcase its premium build. With luminous detailing, 3ATM water resistance, and a secure butterfly clasp, the Aquanaut Midnight Black Edition stands as a statement of confidence, individuality, and timeless design.
Hand assembled to order
Genuine Japanese movement
Individually inspected
BUY 2, GET 1 FREE
Automatically applied at checkout.
WELCOME OFFER
Use code NEW10 for 10% off your first order.
Logo:Seiko Logo
Free WW Shipping
Easy Returns
2-Year Warranty
Free Gift Included
Description
Specifications
2 Years Warranty
Return Policy
Custom Logo Information
What's Included
Description
The Seiko Mod Aquanaut Midnight Black Edition embodies contemporary sport-luxury with refined precision. Its bold black textured dial and luminous numerals ensure flawless readability in any light, while the brushed 316L stainless steel case and durable black rubber strap strike the perfect balance between strength and sophistication. Measuring 41mm, it commands attention with effortless comfort—equally suited for active pursuits or elegant occasions.
Powered by the trusted Seiko NH35 automatic movement, it delivers precision, reliability, and enduring performance rooted in Japanese craftsmanship. A sapphire crystal with anti-reflective coating, screw-down crown, and exhibition case back showcase its premium build. With luminous detailing, 3ATM water resistance, and a secure butterfly clasp, the Aquanaut Midnight Black Edition stands as a statement of confidence, individuality, and timeless design.
Your watch is made using carefully selected premium materials and handcrafted Japanese craftsmanship.
Discover the difference
Sapphire Crystal
Sapphire crystal is used for one simple reason: long-term clarity. It resists everyday scratches and wear, so the watch keeps its appearance without needing extra care or concern.
Japanese Movement
A proven Japanese movement chosen for reliability and serviceability. Built to run consistently day after day, without requiring constant adjustment or attention.
Ceremic Steel
Selected for durability, comfort, and corrosion resistance. Lightweight and hypoallergenic, so it wears comfortably without irritation or long-term wear issues.
NextGen-LumiNova
Applied by hand for even visibility in low light. Designed to remain effective over time, so readability doesn’t fade when you actually need it.
STORE REVIEWS
Rated 4.8 / 5 based on 811+ reviews across all channels. Showing our top reviews.
4.8
5 star
92%
4 star
8%
3 star
0%
2 star
0%
1 star
0%
SM
Sean M.
Verified
·
January 15, 2026
Came in a sturdy case with a 2-year warranty card inside. Packaging felt premium, and the sapphire glass looks crystal clear—amazing first impression.
Seikosub Marine Shadow
JD
John D.
Verified
·
January 12, 2026
Arrived faster than expected and perfectly packaged. The domed glass gives a beautiful vintage vibe, thanks!
Seikosub Milsub Nato
NR
Natan R.
Verified
·
January 10, 2026
Solid build, vintage diver look, and smooth automatic movement—feels pretty premium on the wrist.
Scubamaster 58
MT
Michael T.
Verified
·
January 8, 2026
The presidential bracelet feels super comfortable and solid. Sapphire glass is spotless, and packaging with the warranty card was a great addition.
Seikodate Champagne
LK
Lisandro K.
Verified
·
January 5, 2026
Perfect blue tones and great detailing. Shipping was fast, and the watch came well-packed with a warranty card included.
Speedseiko Blue
DP
David P.
Verified
·
January 3, 2026
Really like the clean edges and smooth finish on this watch. The brushed steel case looks sharp, and the open-heart dial adds a nice touch. Feels well-built and comfortable on the wrist.
Nautiko Emerald
MS
Monty S.
Verified
·
January 1, 2026
Fantastic quality and great attention to detail. It’s easily my new favorite watch. Shipping was fast, packaging was secure, and I’ll definitely be adding more to my collection.
Seitona Bumble Bee
RL
Robert L.
Verified
·
December 28, 2025
Best purchase I've made in a while. The quality is outstanding and worth every penny.
Nautiko Open Heart
GL
George L.
Verified
·
December 25, 2025
The watch arrived spotless—Feels sturdy on the wrist, and the sapphire glass stays perfectly clear.
Seikodate Imperial
CB
Chris B.
Verified
·
December 22, 2025
Superb quality and excellent customer service. This is my favorite MOD store for sure! Love the open back case too.
Nautiko Open Back Case
JD
Joey D.
Verified
·
December 20, 2025
Exceeded my expectations. The details stand out and it feels premium without being over the top. Delivery was smooth and on time. I’ll be ordering again.
Seitona Bumble Bee
SL
Sandro L.
Verified
·
December 18, 2025
Came well packed and protected. The watch has a really nice weight to it and the finishing is clean. No complaints at all.
Seikojust Champagne
SM
Sean M.
Verified
·
January 15, 2026
Came in a sturdy case with a 2-year warranty card inside. Packaging felt premium, and the sapphire glass looks crystal clear—amazing first impression.
Seikosub Marine Shadow
JD
John D.
Verified
·
January 12, 2026
Arrived faster than expected and perfectly packaged. The domed glass gives a beautiful vintage vibe, thanks!
Seikosub Milsub Nato
NR
Natan R.
Verified
·
January 10, 2026
Solid build, vintage diver look, and smooth automatic movement—feels pretty premium on the wrist.
Scubamaster 58
MT
Michael T.
Verified
·
January 8, 2026
The presidential bracelet feels super comfortable and solid. Sapphire glass is spotless, and packaging with the warranty card was a great addition.
Seikodate Champagne
LK
Lisandro K.
Verified
·
January 5, 2026
Perfect blue tones and great detailing. Shipping was fast, and the watch came well-packed with a warranty card included.
Speedseiko Blue
DP
David P.
Verified
·
January 3, 2026
Really like the clean edges and smooth finish on this watch. The brushed steel case looks sharp, and the open-heart dial adds a nice touch. Feels well-built and comfortable on the wrist.
Nautiko Emerald
MS
Monty S.
Verified
·
January 1, 2026
Fantastic quality and great attention to detail. It’s easily my new favorite watch. Shipping was fast, packaging was secure, and I’ll definitely be adding more to my collection.
Seitona Bumble Bee
RL
Robert L.
Verified
·
December 28, 2025
Best purchase I've made in a while. The quality is outstanding and worth every penny.
Nautiko Open Heart
GL
George L.
Verified
·
December 25, 2025
The watch arrived spotless—Feels sturdy on the wrist, and the sapphire glass stays perfectly clear.
Seikodate Imperial
CB
Chris B.
Verified
·
December 22, 2025
Superb quality and excellent customer service. This is my favorite MOD store for sure! Love the open back case too.
Nautiko Open Back Case
JD
Joey D.
Verified
·
December 20, 2025
Exceeded my expectations. The details stand out and it feels premium without being over the top. Delivery was smooth and on time. I’ll be ordering again.
Seitona Bumble Bee
SL
Sandro L.
Verified
·
December 18, 2025
Came well packed and protected. The watch has a really nice weight to it and the finishing is clean. No complaints at all.
Seikojust Champagne
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2-YEAR WARRANTY
GIFT INCLUDED
Experience real craftmanship
HANDCRAFTED WITH JAPANESE CRAFTSMANSHIP, CAREFULLY TESTED, AND BACKED BY CLEAR POLICIES — CONFIDENCE BEFORE AND AFTER PURCHASE.
Sale priceFrom $279.95 USDRegular price$479.95 USD
FAQ
A Seiko mod is a custom watch built around a reliable Japanese Seiko movement, combined with carefully selected aftermarket components.
At MONOMODS, each watch is hand-assembled using proven automatic or hybrid movements, premium materials, and transparent construction, giving you the freedom to enjoy refined designs without counterfeit products.
The goal is simple: Luxury-inspired design, built honestly, and made accessible without shortcuts.
Each watch is assembled to order, ensuring proper fit, performance, and quality.
Here’s what to expect:
Assembly & Quality inspection: 3–5 days
Shipping: 5–12 days
Once assembly is complete, you’ll receive your track & trace details by email.
Delivery times may vary slightly depending on destination, but you’ll always know where your watch is.
Yes.
Shipping is free
Import duties and customs fees are included in the price
There are no surprise charges when your watch arrives. What you see at checkout is what you pay, simple and transparent.
Yes, personalization is at the heart of what we do.
You can customize:
Case
Dial
Hands
Bracelet
Logo or initials
If you’d like help designing a fully personalized watch, contact us via email or live chat.
We’ll guide you through the process step by step.
Yes.
If you’d like a watch with your own logo, you can contact us by email or live chat and share your logo along with the watch model you prefer. We’ll create a design mockup for your approval first.
Once you’ve approved the design, we’ll begin assembling your watch.
Contact
Email: support@monomods.com
Business Hours: 9:00 AM – 5:00 PM Between Monday to Friday, Timezone: (GMT) Greenwich Mean Time (London)
Address : 71-75 Shelton Street, London, WC2H 9JQ, United Kingdom
Description
Specifications
2 Years Warranty
Return Policy
Custom Logo Information
What's Included
Description
The Seiko Mod Aquanaut Midnight Black Edition embodies contemporary sport-luxury with refined precision. Its bold black textured dial and luminous numerals ensure flawless readability in any light, while the brushed 316L stainless steel case and durable black rubber strap strike the perfect balance between strength and sophistication. Measuring 41mm, it commands attention with effortless comfort—equally suited for active pursuits or elegant occasions.
Powered by the trusted Seiko NH35 automatic movement, it delivers precision, reliability, and enduring performance rooted in Japanese craftsmanship. A sapphire crystal with anti-reflective coating, screw-down crown, and exhibition case back showcase its premium build. With luminous detailing, 3ATM water resistance, and a secure butterfly clasp, the Aquanaut Midnight Black Edition stands as a statement of confidence, individuality, and timeless design.
