Movement
The internal mechanism of a watch — the 'engine' — that drives the timekeeping and any additional functions.
What is a Watch Movement?
The movement is everything inside the case that makes a watch work: the power source, the gear train, the escapement, the regulating organ, and the display mechanism. It is to a watch what an engine is to a car — the term is used interchangeably with caliber, which refers to a specific movement model.
Types of Movement
There are three broad categories:
- Manual (hand-wound) — powered entirely by the user winding the crown, which coils the mainspring. Requires regular winding, typically every one to three days.
- Automatic (self-winding) — uses a rotor that spins with wrist motion to wind the mainspring automatically. Can also be wound by hand via the crown.
- Quartz — powered by a battery that sends electrical pulses to a quartz crystal, which vibrates at 32,768 Hz to regulate time. Far more accurate than mechanical movements and requires almost no maintenance beyond battery replacement.
Movement Construction
A mechanical movement is built on a plate (the base) and bridges (upper plates that hold pivot points). The gear train, escapement, and balance wheel are all mounted between these. In Swiss movements you will often see a large "three-quarter plate" design; in German movements (particularly Glashütte) the plate architecture is a defining characteristic.
Servicing Intervals
Mechanical movements require periodic servicing — typically every five to eight years for a modern watch, and more frequently for vintage pieces. This involves complete disassembly, ultrasonic cleaning of all parts, replacement of worn components, fresh lubrication, and timing regulation.