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Article: Datejust NH35 – User Manual & Setup Guide

Datejust NH35 – User Manual & Setup Guide

Lino Vitale-durand

Written by Lino Vitale-durand

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A watch crafted for timeless moments.

Discover how to get the best from your Seiko Mod Datejust – hand-assembled, powered by the NH35 automatic movement.

Getting Started

How to wind and restart your watch

First-time setup

To start your Seiko Mod Datejust:

  • Unscrew the crown if needed
  • Turn it clockwise 25 to 30 times
  • Slightly shake the watch to activate the rotor
  • The watch will start running automatically when worn

Restarting after a pause

If the watch has stopped after not being worn:

  • Rewind using the same method
  • The NH35 has a 41-hour power reserve
  • No need to overwind
  • Wind gently until you feel slight resistance

How to set the time and the date

The NH35 movement features a quick-set date and a stop-second function for accurate time adjustment. Follow these steps carefully:

1. Set the Date:
– Pull the crown to the first click
– Turn it clockwise to change the date
– ⚠️ Never set the date between 8 PM and 4 AM — this could damage the mechanism

2. Set the Time:
– Pull the crown to the second click
– The seconds hand stops (hacking) for precision
– Turn the crown clockwise or counterclockwise to adjust the time
– Push the crown back once done

3. Preserve Water Resistance:
– If your watch has a screw-down crown, always push and screw it back in to ensure proper sealing

Inside: the NH35 Movement

At the heart of your Seiko Mod Datejust lies the trusted NH35 automatic movement — known for its accuracy, durability, and ease of maintenance.

Here’s what makes it exceptional :

– Automatic self-winding: Charges itself with every wrist movement
– Manual winding option: Wind the crown when needed
– Stop-second function: For precise time-setting
– 41-hour power reserve: Keeps running even when not worn
– Robust construction: Ideal for daily use and long-term reliability

Whether you're wearing your watch daily or on special occasions, the NH35 ensures reliable, mechanical precision — no batteries needed.

Adjusting your bracelet size

Each Chrono Mod watch includes a precision screwdriver to help you adjust the bracelet to your wrist.

To remove a link, carefully unscrew the pin located on the side of the bracelet. Once the desired number of links is removed, reinsert and tighten the screw securely.

Always remove one link at a time on each side of the clasp for optimal balance and fit.

Quick-extension for daily comfort

Selected models feature a quick-extension link hidden within the clasp. This system lets you instantly extend the bracelet by approximately 5 mm — perfect for warmer days or subtle wrist adjustments.

The extension folds and unfolds with a smooth, tool-free mechanism, giving you flexibility and comfort without compromising on style.

Warranty & After-Sales Support

  • Water resistance:
    Sapphire caseback – (daily use, no swim)
    Steel caseback – 10 ATM (swim-ready)

  • 24-month warranty on movement and assembly defects
  • Not covered: water damage, impact, wear and tear
  • Need help? Contact us via contact page

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