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A bridge is a structural component fixed to the main plate of a watch movement, supporting and securing pivots, jewels, and components at both ends. Bridges hold the gear train, barrel, and other elements in precise alignment. Unlike a cock (secured at one end), a bridge is anchored at both ends for greater stability. Bridges are often decorated with Geneva stripes, perlage, or anglage in quality movements.
The main plate (or baseplate) is the foundation of the movement — all other components attach to it. Bridges are secondary structural components that mount on top of the plate to hold specific parts (barrel bridge, gear train bridge, balance bridge). Some movements use a single large plate (full-plate design, common in German watchmaking) instead of individual bridges for different components.
Bridge decoration (Geneva stripes, anglage, perlage) reflects the watchmaker's commitment to craftsmanship and quality finishing throughout the movement. Since exhibition casebacks allow enthusiasts to view the movement, decorated bridges enhance the visual experience. Traditional finishing also demonstrates manual skill that cannot be replicated by machines, serving as a quality signal. In haute horlogerie, bridge finishing is as important as timekeeping performance.
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