A mechanical watch does not simply let a spring unwind and hope the hands move at the right speed. It needs a controlled relationship between stored energy and a repeating rhythm. The escapement is central to that relationship, and its operation is behind the familiar ticking sound.
Understanding that job makes a movement easier to appreciate. The mainspring, balance spring and escapement are connected, but they are not interchangeable names for the same component. Each answers a different part of the question of how the watch runs.
Stored energy needs a controlled release
The mainspring supplies energy through a train of gears. In a conventional lever arrangement, the escape wheel and pallet fork interact with the balance to release that energy in measured steps and keep the oscillation going.
The balance swings back and forth, while its fine balance spring contributes the restoring action that supports that rhythm. The escapement links this oscillating system with the powered gear train. The result is a mechanism that advances in a controlled sequence rather than freely unwinding.
Grand Seiko describes the ticking sound as the interaction of the jewelled pallet fork with the escape-wheel teeth each time the balance swings. What sounds like a single simple tick is therefore evidence of very small components repeatedly performing a precise mechanical task.
The two springs have different jobs
The mainspring stores the energy you put into the watch by winding it. The balance spring, also called the hairspring, belongs to the oscillating system that helps determine the rate. A long power reserve describes available running duration; it does not mean the balance spring is simply moving more slowly.
This distinction helps when reading technical stories. A new mainspring material may support an energy objective. A change to the hairspring or escapement may address rate stability, efficiency or other aspects of performance. The manufacturer needs to explain the particular change, rather than the reader assuming every mention of a spring means the same thing.
Two quiet dials with complex machinery behind them
| Reference | Display and case | Movement |
|---|---|---|
| Grand Seiko SBGW231 | Three hands; 37.3 mm steel case | Manual 9S64; approximately 72-hour reserve |
| A. Lange & Söhne Saxonia Thin 201.027 | Hours and minutes; 37 mm white-gold case | Manual L093.1; 72 hours; 3Hz; 167 parts |
The Saxonia Thin has no seconds hand, but its mechanical movement still needs a regulating system. A quiet two-hand dial does not mean the mechanism only moves once a minute. The dial chooses which information to show; the movement must still maintain its operating rhythm.
The Grand Seiko makes that rhythm visible through a central seconds display. Both watches are manually wound, so their energy input differs from an automatic’s rotor system. Their need to regulate the release of that energy remains.
What frequency tells you
A movement frequency of 3Hz means three complete oscillations per second. In the conventional description of beats, that corresponds to six half-oscillations each second, or 21,600 per hour. Be careful to distinguish a complete oscillation from a single beat when comparing figures.
A higher frequency is not a complete quality ranking. Grand Seiko’s account of high-beat development discusses the challenge of supplying energy and maintaining durability as components operate more frequently. The engineering task is to make the whole system work reliably at the chosen rate.
A long history of tiny improvements
A. Lange & Söhne’s account of balance-spring development highlights Richard Lange’s 1930 patent involving beryllium in spring alloys. The historical importance lies in the search for materials that could support more dependable rate performance within a very small mechanism.
The same broad pursuit continues through modern manufacturing methods. Grand Seiko describes using techniques associated with semiconductor production to create precise escapement components. A traditional-looking mechanical watch can therefore combine an established operating principle with contemporary ways of making the parts that implement it.
What to look for through a display back
The moving balance is often the easiest regulating component to identify, because its repeated swinging contrasts with the slower gears around it. The escape wheel and pallet fork are smaller and may be less clearly visible in a completed movement.
A manufacturer diagram or movement explanation can help you relate what you see to the named parts. There is no need to mistake decorative finishing for a particular mechanism or to assume that every visible wheel has the same role.
The escapement is worth understanding because it connects the pleasure of a ticking watch with a concrete engineering problem. Once you can separate energy storage, regulation and display, the specifications of a mechanical watch become a description of how it works, rather than a list of impressive-sounding components.
Based on manufacturer information. Specifications and sources checked on 8 September 2026.
Sources: Grand Seiko UK boutique SBGW231; Seiko 2011 introduction of calibre 9S64; Grand Seiko US boutique SBGW231; Saxonia Thin exact specifications; Saxonia Thin design and movement history; Grand Seiko escapement operation and high-beat development; Grand Seiko energy transfer and escapement manufacture; Lange balance-spring function and Richard Lange history.
Image: AI-generated editorial illustration of the Grand Seiko SBGW231. Design details are approximate; this is not a product photograph.
