• 
  Manufacturer: Seiko Instruments Inc. (SII) / Hattori / TMI


• 
  Caliber Numbers: VH31, VH31A (2 jewels), VH31B (0 jewels)

Dimensions:

• 
  Lignes: 10.5’’’


• 
  Diameter: 23.70 mm


• 
  Casing Diameter: 23.3 mm


• 
  Height: 3.45 mm

Specifications:

• 
  Type: Quartz (Mechaquartz), battery-powered


• 
  Frequency: 32,768 Hz


• 
  Beat Rate: 14,400 vph (2 Hz) with smooth "sweeping" seconds


• 
  Accuracy: ± 15 seconds/month


• 
  Battery Type: 371 (SR920SW)


• 
  Battery Life: Approximately 2 years


• 
  Quartz Crystal: Tuning fork type


• 
  Jewels: 2 jewels (VH31A) or 0 jewels (VH31B)

Functions:

• 
  Hand Count: 3 hands
  
  
  
  • 
    Hour Hand: 1.20 mm
  
  
  • 
    Minute Hand: 0.70 mm
  
  
  • 
    Sweeping Second Hand: 0.17 mm
  
  
  
  


• 
  Central Hours, Minutes, and Sweeping Seconds


• 
  Other Features: True no-date display

Stem Details:

• 
  Supplied Stem: 351177, Tap 10


• 
  Optional Stem (sold separately): 351892, Tap 11

Additional Features:

• 
  Hacking Seconds: Yes


• 
  Country of Manufacture: Made in Japan