Seiko (SII) Caliber NH37A

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. 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 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 The example above is from an AVI-9 Lancaster Bomber here. Be respectful and keep comments on the topic of Seiko (SII) Caliber NH37A. Off-topic/general watch questions belong in the forum. Pro Tip: If you are on social media, use your social media handle as your name. If you create a Caliber Corner account, you can upload a profile pic and link to your sites in your profile.

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