Seiko NH35 vs. Miyota 8215: A Comprehensive Comparison

When it comes to affordable and reliable automatic watch movements, the Seiko NH35 and the Miyota 8215 are two of the most popular choices in the horology world. Both movements are widely used in microbrand watches and offer excellent value for money. However, they have distinct characteristics that set them apart. In this article, we’ll compare the Seiko NH35 and Miyota 8215 in terms of cost, accuracy, durability, weight, size, power reserve, and other key factors to help you decide which one suits your needs best.

Short Descriptions

Seiko NH35
The Seiko NH35 is a Japanese-made automatic movement known for its reliability, robustness, and affordability. It features hacking (second-hand stops when the crown is pulled) and hand-winding capabilities, making it a versatile choice for watch enthusiasts. With a power reserve of approximately 41 hours and a beat rate of 21,600 vibrations per hour (vph), the NH35 is a workhorse movement that has earned a strong reputation in the industry.

Miyota 8215
The Miyota 8215 is another Japanese automatic movement, produced by Citizen. It is a no-frills, dependable movement that has been in production for decades. The 8215 does not feature hacking or hand-winding, which sets it apart from the NH35. It has a power reserve of around 40 hours and operates at a beat rate of 21,600 vph. While it lacks some features, it remains a popular choice due to its simplicity and affordability.

Comparison

1. Cost

Both movements are budget-friendly, but the Miyota 8215 is generally slightly cheaper than the Seiko NH35. This makes the 8215 an attractive option for brands looking to minimize costs. However, the price difference is often marginal, and the added features of the NH35 often justify its slightly higher cost.

2. Accuracy

• Seiko NH35: Typically, the NH35 has an accuracy range of -20 to +40 seconds per day, though many units perform better than this specification.
• Miyota 8215: The 8215 has a similar accuracy range of -20 to +40 seconds per day, but it is more prone to positional variance due to its unidirectional rotor design.

In real-world use, the NH35 tends to be slightly more consistent in maintaining accuracy.

3. Durability

Both movements are known for their durability, but the Seiko NH35 has a slight edge due to its more modern design and construction. The NH35 is less prone to wear and tear over time, especially in terms of rotor noise and winding efficiency. The Miyota 8215, while durable, can develop rotor noise (a common issue reported by users) after prolonged use.

4. Weight and Size

• Seiko NH35: The NH35 measures 11.5mm in height and weighs approximately 21 grams.
• Miyota 8215: The 8215 is slightly slimmer at 5.67mm in height and weighs around 19 grams.

The Miyota 8215’s thinner profile makes it a better choice for slimmer watch designs, while the NH35’s slightly thicker build is more suited to robust, tool-style watches.

5. Power Reserve

• Seiko NH35: Offers a power reserve of approximately 41 hours, meaning it will continue running for nearly two days if not worn.
• Miyota 8215: Provides a slightly shorter power reserve of around 40 hours, which is still respectable but marginally less than the NH35.

While the difference is minimal, the NH35’s slightly longer power reserve may be advantageous for those who rotate watches frequently or don’t wear their watch every day.

6. Features

• Seiko NH35: Offers hacking and hand-winding, which are absent in the Miyota 8215. These features provide greater convenience and precision for users.
• Miyota 8215: Lacks hacking and hand-winding, which can be a drawback for some watch enthusiasts. However, its simplicity makes it easier to service and maintain.

7. Rotor Noise

The Miyota 8215 is often criticized for its rotor noise, which can be noticeable during wrist movement. The Seiko NH35, on the other hand, has a quieter rotor, making it a more refined option.

8. Availability and Serviceability

Both movements are widely available and easy to service, thanks to their popularity and the abundance of spare parts. However, the NH35’s more modern design and additional features make it a more future-proof choice.

Conclusion

The Seiko NH35 and Miyota 8215 are both excellent automatic movements that offer exceptional value for money. The NH35 stands out with its hacking, hand-winding, quieter rotor, and slightly longer power reserve, making it a more versatile and refined option. On the other hand, the Miyota 8215’s slimmer profile and lower cost make it a compelling choice for brands and consumers prioritizing simplicity and affordability.

Ultimately, the choice between the two depends on your specific needs and preferences. If you value additional features, a quieter operation, and a marginally better power reserve, the Seiko NH35 is the better choice. However, if you’re looking for a slim, no-frills movement at a lower cost, the Miyota 8215 is a solid contender. Both movements have proven their reliability over time, ensuring that you can’t go wrong with either option.