Seiko VK64A

TABLE OF CONTENTS

• Overview
• Accuracy
• Time Setting

Overview

The VK64A is a hybrid meca-quartz chronograph movement that blends quartz accuracy with the mechanical feel of a traditional chronograph. The quartz timekeeping ensures precision, while the mechanical chronograph module delivers a smooth, sweeping motion for the stopwatch function.

This movement includes a date complication for added functionality, making it a versatile choice for a wide range of watch designs. Known for its reliability, affordability, and efficiency, the VK64A features an instant reset chronograph and low-maintenance operation, offering a seamless balance between modern technology and classic watchmaking.

Specifications

• Type: Meca-Quartz
• Battery: 394 (SR936SW) battery (Recommended battery is SEIZAIKEN)
• Battery life: Approx. 3 years
• Accuracy: ±20 seconds per month 
• Jewels: 0
• Vibrations per Hour (BPH): 32,768
• Function: - Date display with quick date correction (optional); Chronograph : maximum count for 60 minutes per cycle; 24 hour indicator (Synchronized regular hour hand).
• Hand-Winding: No
• Diameter: 30.80mm
• Thickness: 5.10mm
• Crown Position: 3 o’clock (standard)
• Date Function: Quick-set date at 3 o’clock (optional)    
• Day Function: No 
• Operation temperature range: From - 5 °C to + 50 °C
• Antimagnetic ≧1600 A / m (Direct current magnetic field)

Time Setting

1. Unscrewed crown base position
2. Date setting (if present)
3. Time setting

This movement is used in the following references

U3-8B

U3-8N

U3-8O

U3-A

U3-AN

U3-AS

U3-CDL

U3-F

U3-FFF

U3-FN

U3-HCC

U3-HS

U3-JC

U3-RUF-B

U3-RUF-G

U3-U

U3-ULV

U3-ULVN
U3FB-TS

UC3-NLMK

UC3-NTM