SII NH37A / Seiko 4R37A

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12”’ | Automatic | Swiss Lever | Sweeping Seconds | Date |

Remarks:

  • Automatic with bidirectional winding, manual winding possible
  • Sweeping seconds with hacking
  • Date with quick setting
  • 24 h indicator at 10:30H
  • The NH37A is equivalent to the Seiko 4R37A
  • Lifting angle 53°
  • Automatic winding by Seiko Magic Lever
  • Rotor with ball bearings
  • Various plastic parts for the date mechanism
  • Extra plastic dial holder
  • Part of a movement family:
    • NH35: Date
    • NH36: Date, day
    • NH37: Date, 24 h indicator
    • NH38: no date, no day, no 24 h indicator
    • NH39: 24 h indicator

 

  • Listing ID: 2904
  • Manufacturer / Brand: SII / Seiko
  • Caliber: SII NH37A / Seiko 4R37A
  • Size: 12''', Height 5.32 mm
  • Shape: Round
  • Winding: Automatic
  • Hand Setting: Crown
  • Seconds Hand: Sweeping seconds (central seconds)
  • Escapement: Lever (Swiss, English, Glashütte)
  • Date & Day: Date
  • Jewels: 24
  • Setting Lever Screw/Pin Position: Left
  • Balance Position: Bottom (120 - 240°)
  • Shock Protection: Seiko Diashock (not the classic "flower shape"!)
  • Beats per hour: 21,600
  • Balance Type: Glucydur
  • Power Reserve: Approx. 40 hours
  • Production Period: From 2011
  • Identification: Original data sheet available. Movement labeled NH37A
  • External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-31#post-4052610
  • Country: Japan
  • Contributor ©: Uhrforum.de member Badener (Andreas Kelz)

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