The NH35 Automatic Movement, Explained

The NH35 is a self-winding mechanical movement born from decades of movement engineering — a caliber refined through millions of watches and generations of iteration. It is a three-hand automatic with 24 jewels, a beat rate of 21,600 vibrations per hour (3 Hz), and a power reserve of roughly 41 hours. It offers both hacking seconds and manual hand-winding, the two features that make a mechanical watch genuinely usable as a daily object.

It belongs to the NH family — a lineage of no-date, day-date, and higher-beat calibers all sharing the same architecture and the same engineering philosophy. The NH35 is the no-date, three-hand expression of that family, which makes it the natural choice when a dial should be uninterrupted by a date window.

There is a reason the NH35 became the most widely trusted automatic caliber among independent watchmakers. It is reliable in the way that only a mature, long-produced design can be — every weakness in the architecture has been found and addressed over years of real-world wear. It is serviceable by any competent watchmaker, with inexpensive parts and a well-documented architecture. And it is honest: it does what it claims, for a long time, without drama.

Choosing a proven movement is not a compromise. It is a deliberate decision to build on something that already works, so that the design energy can go where the wearer actually lives — the dial, the hands, the proportions, the finish. A movement that has earned its reliability frees everything around it to be considered.

An automatic movement winds its mainspring from the motion of the wearer's wrist. A weighted rotor pivots on a bearing; as the rotor spins, a reversing gear train transfers that rotation in a single direction to wind the mainspring barrel. The system is entirely mechanical — no battery, no charging, only motion converted into stored energy.

• The mainspring stores energy in its wound state.
• The gear train releases that energy at a controlled rate.
• The escapement meters the release, advancing the hands in precise steps.
• The balance wheel oscillates at a fixed frequency — 21,600 beats per hour — and that beat is what you hear as the ticking.

When the watch is at rest, the stored power reserve keeps it running. Hand-winding tops it up through the crown; the automatic mechanism adds to the same reserve as you move through the day.

Hacking seconds means the second hand stops the moment you pull the crown to the time-setting position. A small lever presses against the balance wheel, halting the oscillation so the watch can be set precisely against a reference time. It is the feature that makes a mechanical watch accurate to set, not just to run.

Hand-winding means the mainspring can be wound through the crown, like a traditional manual-wind watch, rather than relying on the rotor alone. Together, these two features make the NH35 a movement that behaves the way a mechanical watch should — precise to set, convenient to wear, and ready whenever you pick it up.

A well-regulated NH35 runs comfortably within a few seconds a day — close enough that it is indistinguishable from a far more expensive movement on the wrist. A skilled watchmaker can adjust the regulator to suit the wearer's habits, dialing in a rate that accounts for how the watch is actually worn and stored. This is the art of regulation: matching a movement's behavior to a person's life.

Like any mechanical movement, the NH35 responds to position and temperature. It is not adjusted to six positions at the factory the way a chronometer-grade movement is, which means it shows a little more variance between resting positions. This is normal, expected, and part of what makes a mechanical watch a living object rather than a static instrument.

The NH35 is the kind of movement that earns its place through time rather than spectacle. It is not decorated for a display caseback, and it does not pretend to be. It is engineered to run, to last, and to be serviced — the qualities that matter over the years a watch is actually worn.

The movement is the foundation. The design is the work. Understanding the NH35 is understanding where one ends and the other begins — and why a proven foundation is the strongest place for design to begin.