NH35A Movement Accuracy: What Collectors Should Know About This Popular Automatic Caliber

The NH35A automatic movement has become one of the most popular calibers in affordable mechanical watches. According to Time Module's technical documentation, the NH35A accuracy range is within -20 to +40 seconds per day under normal conditions, making it a reliable workhorse for watch enthusiasts.

NH35A Accuracy Specifications

Time Module claims that the NH35A accuracy range is within -20 to +40 seconds per day under normal conditions. They recorded these accuracy measurements without the date complication being active. While this may not seem impressive compared to COSC-certified movements, it represents excellent value for the price point.

Specification	NH35A Rating	COSC Standard
Accuracy Range	-20 to +40 sec/day	-4 to +6 sec/day
Power Reserve	41 hours	Varies by movement
Frequency	21,600 vph	28,800 vph typical
Jewels	24	Varies

Real-World Performance

According to community discussions on Caliber Corner, many NH35A owners report better-than-specified accuracy. User experiences show significant variation:

• Some owners achieve +2 seconds per day after break-in period
• Others report consistent +10 seconds per day performance
• A few experience -5 to +15 seconds per day range

One user reported: "I agree that this NH35A movement is truly impressive for the cost and its accuracy. I have an INVICTA which cost about $100 but keeps on time with the NIST Atomic clock on a winder or when worn within 10 seconds per day."

Factors Affecting NH35A Accuracy

Several factors can influence the actual accuracy of NH35A movements:

• Position: Watches typically run faster when worn than when stationary
• Temperature: Extreme temperatures can affect balance wheel oscillation
• Magnetism: Magnetic fields can dramatically impact timekeeping
• Power Reserve: Accuracy may vary as mainspring unwinds
• Break-in Period: New movements often improve over first few weeks

When to Consider Regulation

According to technical experts, regulation should be considered when:

When you attempt to get a measurement of your watch's accuracy with a timing machine, it's important to make sure your watch is fully wound or the lack of power reserve may skew the test results. Time Module states that measurements should be done within 10-60 minutes after the movement is fully wound up.

Frequently Asked Questions

Can the NH35A be regulated to COSC standards?
While possible with careful adjustment, achieving consistent COSC performance from an NH35A is challenging. However, many owners achieve +/- 5 seconds per day with professional regulation.

How does the NH35A compare to Swiss movements?
The NH35A offers comparable reliability to Swiss movements at a fraction of the cost. Its accuracy is suitable for most daily wearing situations.

What affects NH35A accuracy most?
Magnetism is the single biggest threat to accuracy. Keep your NH35A watch away from magnetic fields including phone cases, laptop speakers, and magnetic clasps.

Source: According to Caliber Corner and Time Module technical documentation

Learn more about watch accuracy in our guide to understanding normal watch accuracy.