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Glossary of watchmaking

Breguet overcoil

Spiral plat coudé ou Bréguet | 巻上げヒゲゼンマイ/マキアゲヒゲゼンマイ | 宝玑双层游丝

Spiral coudé ou Breguet © Fondation de la Haute Horlogerie

Sometimes referred to as a "Breguet spiral", it controls the rate at which the mainspring unwinds.