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Where "Chronograph" refers to the function of a watch, chronometer is a measure of how well a given mechanical timepiece performs: in order to be labeled a chronometer the timepiece must be certified by the COSC, the official Swiss Chronometer testing institute, [20] after undergoing a series of rigorous tests for robustness, accuracy and ...
Mechanical wrist watch disassembled A chronograph watch, with stopwatch functions. The internal mechanism of a watch, excluding the face and hands, is called the movement. All mechanical watches have these five parts: A mainspring, [4] which stores mechanical energy to power the watch.
ETA/Valjoux 7750 (photo 2009) Chart of historic Valjoux movements Valjoux (for Vallée de Joux, "Joux Valley") is a Swiss manufacturer of mechanical watch movements.It is known primarily for chronograph ébauche movements that are used in a number of mid- to high-range mechanical watches.
A 1928 Movado Ermeto mechanical chronometer. A mechanical chronometer is a spring-driven escapement timekeeper, like a watch, but its parts are more massively built. Changes in the elasticity of the balance spring caused by variations in temperature are compensated for by devices built into it. [2]
The Rolex Cosmograph Daytona is a mechanical chronograph wristwatch designed to meet the needs of racing drivers by measuring elapsed time and calculating average speed. Its name refers to Daytona, Florida, where racing flourished in the early 20th century.
Chronograph mechanism with cams, 2 push buttons, chronograph 60 seconds, 30 minutes and 12 hours counters, date in window, 24 hour hand with second time mechanism 6497-1 [25] Yes Yes small second No No No No — Lépine calibre: 6497-2 [26] Yes Yes small second No No No No — Lépine calibre: 6498-1 [27] Yes Yes small second No No No No ...
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