The Seiko NH35 movement, also known as the NH35A, is a marvel of modern horology, celebrated for its reliability, affordability, and versatility. This automatic movement has become a cornerstone for many watch enthusiasts and microbrands, offering a blend of precision and durability that is hard to match.
Origins and Development
Technical Specifications
The NH35 is a self-winding mechanical movement with a 24-jewel configuration. It operates at a frequency of 21,600 vibrations per hour (vph), or 3 Hz, which provides a smooth sweep of the second hand. The movement also features hacking and hand-winding capabilities, allowing for precise time-stting and manual winding when needed.
One of the standout features of the NH35 is its power reserve. With a fully wound mainspring, the movement can run for approximately 41 hours. This is more than sufficient for most daily wearers, ensuring that the watch remains accurate and reliable even if not worn every day.
Design and Construction
The NH35 is designed with durability in mind. It incorporates Seiko’s proprietary Diashock system, which protects the movement from shocks and impacts. This makes it an excellent choice for Koolmods watches where sports and robustness are essential.
The movement’s bidirectional winding mechanism, known as the Magic Lever, is another highlight. This system allows the rotor to wind the mainspring efficiently in both directions, reducing the time needed to fully wind the watch and enhancing overall reliability.
Popularity and Usage
The NH35 has gained immense popularity among microbrands and watch modders. Its affordability and ease of use make it a go-to choice for those looking to create custom watches or start their own watch brands. The movement’s compatibility with a wide range of watch cases and dials further adds to the appeal.
Many brands like Koolmods utilise the NH35 in timepieces, leveraging its reliability and performance to offer high-quality watches at accessible price points. The movement’s versatility means it can be found in many watches including expensive watches today.
Performance and Accuracy
In terms of accuracy, the NH35 is rated to perform within -20 to +40 seconds per day under normal conditions. However, many users report much better accuracy, often within a few seconds per day. This level of precision is impressive for a movement in this price range and contributes to its reputation as a reliable workhorse. Koolmods tests the accuracy of each and every movement prior to shipping. Our tolerance is much stricter. We test and regulate each movement to sit between +/-5-15 seconds.
Maintenance and Longevity
One of the reasons the NH35 is so highly regarded is its longevity. Based on the Seiko 7S26 movement, which is known for its durability, the NH35 can last for many years with minimal maintenance. The inclusion of plastic parts in certain areas reduces the need for frequent lubrication, further enhancing the lifespan of the watch.
When it comes to servicing, the NH35 is relatively straightforward.
The Seiko NH35 movement stands as a testament to Seiko’s commitment to quality and innovation. Its combination of reliability, affordability, and versatility has made it a favourite among watch enthusiasts and professionals alike. Whether you’re a seasoned collector or a newcomer to the world of horology, the NH35 offers a compelling blend of performance and value that is hard to beat.
From its robust construction to its impressive accuracy, the NH35 continues to set the standard for affordable automatic movements. As more brands and modders embrace this movement, its legacy is sure to endure, cementing its place as a cornerstone of modern watchmaking.
