Seiko NH35A

TABLE OF CONTENTS

• Overview
• Accuracy
• Time Setting

Overview

The NH35(A) features a self-winding mechanism that powers the watch through the natural movement of the wearer. As the wearer moves, the rotor spins, gradually winding the mainspring. The watch continues winding until it reaches full capacity, at which point it offers a 40-hour power reserve. This allows it to run for up to 40 hours without being worn. 

Selected for its affordability, reliability, accuracy, and availability, this mechanism ensures years of trouble-free timekeeping.

Specifications

• Type: Automatic (Self-winding) with Manual Winding Capability
• Power Reserve: More than 41h
• Accuracy: -20 to +40 seconds per day
• Jewels: 24
• Vibrations per Hour (BPH): 21,600 (3 Hz)
• Shock Protection: Diashock
• Hacking Function: Yes (seconds hand stops when setting the time)
• Hand-Winding: Yes
• Diameter: 27.4mm
• Thickness: 5.32mm
• Stem Type: Tap 10 (Standard Seiko Stem)
• Crown Position: 3 o’clock
• Date Function: Quick-set date at 3 o’clock (optional)
• Day Function: No
• Rotor: Bi-directional winding via Seiko’s Magic Lever system

Time Setting

1. Wind the Watch
   Unscrew crown and pull it to position 1 and rotate clockwise 25–30 times to charge the mainspring
2. Set the DATE. 
   Push the crown to Position 2 and rotate CounterClockwise to move Calendar Disc if present.
3. Set the Time
   Pull the crown to Position 3. Rotate clockwise or counterclockwise to set the time. The seconds hand will hack (stop).
4. Tighten the crown
   To ensure water resistance, you must always tighten the crown before use. For watches with a screw-down crown, press the crown in while turning it clockwise until it is fully screwed down against the watch case to create a watertight sea

This movement is used in the following references

U1-A

U1-B

U1-BF

U1-BFN

U1-BN

U1-BTP

U1-C

U1-D

U1-DHK

U1-DL

U1-DN

U1-DW

U1-DWN

U1-DZ

U1-DZN

U1-E

U1-EC

U1-EG

U1-EM

U1-EMN

U1-EN

U1-ER

U1-F

U1-FD

U1-FDN

U1-FL

U1-FM

U1-FMN

U1-FN

U1-GM

U1-HC

U1-KSA

U1-ML6

U1-MLB

U1-MLBN

U1-MLM

U1-MoMA-B

U1-MoMA-G

U1-MoMA-Y

U1-MP

U1-MY

U1-MY2

U1-NR

U1-NRN

U1-NU

U1-PA

U1-PAB

U1-PAN

U1-PAR

U1-SP

U1-SS

U1-SS2

U1-SS3

U1-SW1

U1-SWN1

U1-U

U1-V6

U2-AB

U2-AG

U2-B

U2-BN

U2-C

U2-CN

U2-F

U2-FN

U2-MMC

U2-NC

U2-RA

U4-A

U4-BTS

U4-BTY

U4-PS

U4-RE

U4-TA

U4-WAT

UC4-AH