Seiko VH31A

TABLE OF CONTENTS

• Overview
• Specifications
• Time Setting
• This movement is used in the following references

Overview

The Seiko VH31A is a high-precision quartz movement that mimics the smooth sweeping motion of a mechanical watch, offering a more fluid and refined experience.

This movement is valued for its accuracy, efficiency, and affordability, making it an excellent choice for those who appreciate the aesthetics of mechanical timekeeping without sacrificing the reliability of quartz technology. With its compact design and low power consumption, the VH31A is a versatile option for both dress and casual watches, delivering a seamless blend of tradition and innovation.

Specifications

• Type: Quartz
• Battery: SR920SW (Recommended battery is SEIZAIKEN) 
• Battery life: Approx. 2 years
• Accuracy: ± 15 seconds per month
• Jewels: 2
• Type of quarts oscillator: Tuning fork
  
• Vibrations per Hour (BPH): 32,768
• Hand-Winding: No
• Diameter: 23.70mm
• Thickness: 3.45mm
• Crown Position: 3 o’clock (standard)
• Date Function: No   
• Day Function: No 
• Operation temperature range: From - 5 °C to + 50 °C
• Antimagnetic ≧1600 A / m (Direct current magnetic field)

Time Setting

1. Unscrew crown
   Turn the crown counterclockwise to unscrew it, then pull it out to position 1.
   
2. Set the Time
    Pull the crown to Position 2. Rotate clockwise or counterclockwise to set the time. The seconds hand will hack (stop).
3. 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

UT1

UT4

UT4-AA

UT4-AA2

UT4-AA3

UT4-B

UT4-SP

UT4-T-M