SEIKO Sii Automatic Watch Movement NH37A

( Brand: Seiko ), ( Manufacturer Part Number: NH37 ), ( Type: Movement ), ( Movement Type: Mechanical )

Review SEIKO Sii Automatic Watch Movement Date

Seiko NH37 SII (NH37A) Automatic Watch Movement - A Superior Timekeeping Engine

The Seiko NH37 SII (NH37A) Automatic Watch Movement is a testament to Seiko's unwavering commitment to precision, durability, and style. This self-winding mechanism is a finely tuned piece of engineering, designed to provide accurate and reliable timekeeping for your watch.

At the heart of the NH37 SII lies a 24-jewel automatic movement, which offers a power reserve of approximately 41 hours. The movement oscillates at a frequency of 21,600 vibrations per hour (6 beats per second), ensuring a smooth and consistent flow of energy to the watch's hands. The movement is also equipped with a hacking function and manual winding capacity, allowing for greater accuracy when setting the time and providing an alternative power source when necessary.

The NH37 SII movement features Seiko's Diashock protection system, which absorbs shocks and vibrations to prevent damage and maintain accuracy. This system consists of a special spring and damping material that absorbs shocks and returns the balance wheel to its original position. Additionally, the movement is protected by a hardlex crystal, which offers superior scratch resistance compared to traditional mineral crystals.

The NH37 SII movement is a 21mm caliber, making it suitable for a wide range of watch sizes. Its sleek design and compact dimensions make it a popular choice for both dress and casual watches, offering a versatile option for watch enthusiasts and collectors.

In conclusion, the Seiko NH37 SII (NH37A) Automatic Watch Movement is a high-quality, reliable, and durable timekeeping solution. Its superior craftsmanship, innovative features, and stylish design make it an ideal choice for anyone looking for a dependable and accurate automatic movement for their watch.

The Seiko NH37 and NH37A automatic watch movements are popular choices among watch enthusiasts due to their reliability, affordability, and ease of use. Here are some pros and cons to consider:

1. Affordability: The Seiko NH37 and NH37A movements are significantly cheaper than many high-end automatic movements, making them accessible to a wider range of watch buyers.

2. Reliability: Seiko is renowned for its quality and precision, and the NH37 and NH37A movements are no exception. They are known for their robustness and long service life.

3. Easy to find: Seiko movements are widely available, making it easy to find parts and repair services if needed.

4. Hand-winding and hacking: Both the NH37 and NH37A movements allow for hand-winding and hacking, giving the user more control over the watch.

5. Power Reserve: The NH37 and NH37A movements have a power reserve of approximately 41 hours, which is sufficient for most users.

1. Thickness: The Seiko NH37 and NH37A movements are thicker than some other automatic movements, which can make them less suitable for slimmer watch cases.

2. Winding efficiency: Compared to more expensive automatic movements, the NH37 and NH37A movements may not be as efficient at winding, requiring more hand movements to build up power.

3. Beat rate: The NH37 and NH37A movements have a beat rate of 21,600 bph, which is slower than some high-end movements and may result in slightly less accuracy.

In conclusion, the Seiko NH37 and NH37A movements offer a solid balance of affordability, reliability, and functionality. They are a great choice for those looking for a high-quality automatic movement without breaking the bank. However, keep in mind that their thicker profile and slightly lower winding efficiency may be a drawback for some users. If accuracy, thinness, or winding efficiency are critical factors, it may be worth considering a more expensive movement.

Details:

Seiko SII NH37 / NH37A Automatic Watch Movement Date 3, Line: 12 Round Thickness: 5.32mm Hands: 89/150/21 width : 27.40mm - Casing Diameter 29.36mm Jewels: 24, Movements are non returnable.

part #: nh37 prices

• $40.37-$94.95

specifications movementparpar:

• brand: Seiko
• mpn: Nh37
• type: Movement
• movement type: Mechanical

returns movementparpar:

• policy: No Returns

seller movementparpar:

• # reviews: 14623
• city: Copperopolis, California
• rating: 99.6%

payments movementparpar:

• credit card: Diners-club
• wallet: Paypal
• other

general movementparpar:

• condition: New with tags
• Parts, Tools Guides > Parts > Movements

offer movementparpar:

• sold: 0
• quantity: 3
• availability: In Stock
• started: January 31, 2026
• options: Ship-to-home

shipping movementparpar:

• transit: 5-10 Days
• cost: $0.00
• type: Calculated
• class: Standard
• service: USPS Ground Advantage
• carrier: USPS

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