Seiko (SII) Caliber NH37A Watch Movement

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Seiko SII Caliber NH35

ManufacturerSeiko
Caliber NumberNH37A (aka NH37)
Base CaliberNH35A
Movement TypeAutomatic
Jewels24
Vibrations Per Hour 21,600 bph
Shock SystemDiashock
Power Reserve 41 hours
Winding Direction Bi-directional with one way clutch
Hacking?Yes
Hand-Windable?Yes
Diameter27.40mm (outside) / 29.36mm (casing)
Height5.32mm
FunctionsHours, minutes, central seconds, date calendar, 24 hour indicator
Country of ManufactureJapan/Malaysia
Known Brands AVI-8 Lancaster Bomber (add more in the comments below)

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The Seiko/TMI/SII caliber NH37 is a hand-windable, hacking variation of the widely popular caliber NH35A – one of the world’s most popular automatic movements and is widely available in many affordable/microbrand watches. In comparison, the NH37A listed here has an additional complication: a 24 hour indicator. This is the only difference between the NH35 and NH37.

Crown Position Functions:

0 (against the case): Clockwise = Manual Winding / Counterclockwise = Nothing 1 (pulled out one click): Clockwise = nothing / Counterclockwise = Date setting 2 (pulled out two clicks): Time setting clockwise and counterclockwise

More Information

Interesting Note: Time Module aka Seiko Instruments labels the NH calibers as part of the “Basic” Mechanical Series. They also have NE calibers that are labeled as “Premium” Mechanical Series.

  • For complete specs and drawings, see this pdf
  • Parts catalogue for caliber NH37A
  • Also see this thread: Seiko NH Caliber Comparison/Differences
  • More watch models with the caliber NH35 here
  • Difference between SII and TMI

Seiko Caliber Nh37

Seiko Caliber Nh37a

Seiko Nh37a Gears

Seiko Nh37a Anti Shock

The example above is from an AVI-9 Lancaster Bomber here.

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