SEIKO (SII) NH37 24 Hour Wheel #0157182

Product Description

The SEIKO (SII) NH37 24 Hour Wheel (#0157182) is a genuine Japanese-made component for the NH37 automatic movement. This wheel drives the 24-hour subdial (commonly positioned near 10:30 or 12 o’clock), enabling a day/night or AM/PM indicator that follows the main hour hand. As an original factory part, it is the ideal choice for replacing worn or damaged 24-hour wheels during movement service or repair.

Features & Function

• Genuine Seiko/SII part – authentic Japanese‑made component for the NH37 movement

• 24‑hour indicator drive – powers the 24‑hour subdial for day/night or AM/PM display

• NH37 specific – designed for the NH37 caliber, which features a 24‑hour subdial and date function

• Direct replacement – drop‑in replacement for worn or damaged 24‑hour wheels

Specifications

• Part Number: 0157182

• Compatible Movement: Seiko NH37 (also known as 4R37)

• Movement Base: NH35A (variant with 24‑hour complication and date)

• Movement Frequency: 21,600 vph (3 Hz)

• Jewels: 24

• Power Reserve: >41 hours

• Features: Hacking (seconds stop), hand‑winding, 24‑hour subdial, date function

• Origin: Japan

Applications

• Service and overhaul – replacing worn or damaged 24‑hour wheels in NH37 movements

• Movement restoration – restoring proper 24‑hour subdial function after prolonged use or impact damage

• Suitable for professional watchmakers and experienced repair technicians

FAQs

1. Is this a genuine Seiko/SII part?

Yes, this is a genuine Seiko (SII/TMI) factory part made in Japan. The NH37 is manufactured by Seiko Instruments Inc. (SII) and distributed by Time Module Inc. (TMI).

2. Which movements is this 24‑hour wheel compatible with?

This 24‑hour wheel is specifically designed for the Seiko NH37 movement. The NH37 is based on the NH35A caliber with the addition of a 24‑hour complication and date function. The 24‑hour hand follows the main hour hand and is not independently adjustable.

3. What are the signs that the 24‑hour wheel needs replacement?

Common signs include the 24‑hour hand not advancing correctly, stopping, or becoming misaligned with the main hour hand. A qualified watchmaker can diagnose these issues during servicing.

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