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2. Chronometer watch - Wikipedia

   en.wikipedia.org/wiki/Chronometer_watch

   More than 1.8 million officially-certified chronometer certificates, mostly for mechanical wristwatch chronometers (wristwatches) with sprung balance oscillators, are being delivered each year, after passing the COSC's most extreme tests and being singly identified by an officially-recorded individual serial number. According to COSC, an ...

3. COSC - Wikipedia

   en.wikipedia.org/wiki/COSC

   Mechanical watches can be first COSC ISO 3159 "Chronometer" certified and after that METAS N001 "Master Chronometer" certified when all the relevant requirements are met. The first mechanical watches that met the METAS Certified Master Chronometer requirements featured Omega 8900 series automatic movements.

4. John Arnold (watchmaker) - Wikipedia

   en.wikipedia.org/wiki/John_Arnold_(watchmaker)

   Until around 1796, Earnshaw made watches with flat balance springs only, [29] [30] but after 1800 practically every marine chronometer, including those by Earnshaw, had a helical spring with terminal overcoils. Arnold was the first to produce marine and pocket chronometers in significant quantities at his factory at Well Hall, Eltham from ...

5. Chronograph - Wikipedia

   en.wikipedia.org/wiki/Chronograph

   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, [21] after undergoing a series of rigorous tests for robustness, accuracy and ...

6. Quartz clock - Wikipedia

   en.wikipedia.org/wiki/Quartz_clock

   Quartz clocks and quartz watches are timepieces that use an ... One of the first successes was a portable quartz clock called the Seiko Crystal Chronometer QC ...

7. List of watchmakers - Wikipedia

   en.wikipedia.org/wiki/List_of_watchmakers

   Hans Apel (1905–1958), German watch and chronometer maker, Glashütte, student of Alfred Helwig. Fred Lip (1905–1996), French producer of watches and machines, Besançon, Lip. Walter Storz (1906–1974), German master watchmaker, Hornberg, founder of the Stowa clock company.