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  Manufacturer: SII (Seiko Instruments Inc.), a product of the Seiko Group of Companies


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  Type: Self-winding (Automatic)


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  Hands:
  
  
  
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    Configuration: 3 hands (hour, minute, sweep second)
  
  
  • 
    Dimensions: Hour 1.00 mm / Minute 0.65 mm / Sweep Second 0.21 mm
  
  
  
  


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  Size:
  
  
  
  • 
    Diameter: 7 3/4 Ligne (17.50 mm)
  
  
  • 
    Movement Height: 5.92 mm
  
  
  
  


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  Display:
  
  
  
  • 
    Day & Date Window: Positioned at 3:00
  
  
  
  


• 
  Jewels: 21 jewels


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  Stem:
  
  
  
  • 
    Part Number: 351-420
  
  
  
  


• 
  Additional Features:
  
  
  
  • 
    Reliable and efficient automatic movement with classic day and date functionality
  
  
  • 
    Suitable for compact watch designs requiring precision engineering
  
  
  
  

This movement is an excellent choice for quality timepieces, blending traditional watchmaking craftsmanship with practical features.