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  Manufacturer: Seiko

  
  


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  Caliber Number: NH37A (also known as NH37)

  
  


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  Base Caliber: NH35A

  
  


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  Specifications:

  
  
  
  
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    Movement Type: Automatic
  
  
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    Jewels: 24
  
  
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    Vibrations Per Hour: 21,600 bph
  
  
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    Shock System: Diashock
  
  
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    Power Reserve: 41 hours
  
  
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    Winding Direction: Bi-directional with one-way clutch
  
  
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    Hacking: Yes
  
  
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    Hand-Windable: Yes
  
  
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    Diameter:
    
    
    
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      Outside: 27.40 mm
    
    
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      Casing: 29.36 mm
    
    
    
    
  
  
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    Height: 5.32 mm
  
  
  
  


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  Functions:

  
  
  
  
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    Hours, minutes, central seconds
  
  
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    Date calendar
  
  
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    24-hour indicator
  
  
  
  


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  Country of Manufacture: Japan/Malaysia

  
  

This versatile automatic movement is ideal for various timepiece applications, offering hacking and hand-winding capabilities, 24 jewels for precision, and a robust power reserve. The NH37A is built for reliability with Seiko's Diashock shock system and bi-directional winding, making it a great choice for both everyday wear and high-performance watches.