It's topped by a durable aluminum unidirectional bezel in black, which is engraved with a silver graduated scale usable for the calculation of diving time. It frames a black dial background with luminous silver Dauphine hands and thick baton dial markers. Other features include a 42-hour power reserve, screw-in caseback, screw-locked crown, and scratch-resistant and glare-proofed domed sapphire crystal. It's completed by a silver stainless steel link bracelet band that offers polished highlights, which is joined by a secure deployment buckle. This adjustable band measures 7 inches in length.
Originally created in the 1750s, the first chronometers were clocks that were accurate enough to calculate the longitude of a ship's position. Today, the chronometer label is bestowed upon timepieces that have undergone precision tests and received a certificate from the official COSC (Control Officile Suisse de Chronometers) regulatory organization that rigorously tests and certifies (or fails) watch movements for chronometer status.
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