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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. [30]
The Omega Marine Chronometer was the first quartz wristwatch ever to be awarded certified status as a marine chronometer. The watch was made by Omega SA and developed by John Othenin-Girard and is one of the most accurate non thermo-compensated production watches ever made, keeping time to within 1 second per month [1]
Omega SA is a Swiss luxury watchmaker based in Biel/Bienne, Switzerland. [1] Founded by Louis Brandt in La Chaux-de-Fonds in 1848, the company formerly operated as Louis Brandt et Fils [2] until incorporating the name Omega in 1903, becoming Louis Brandt et Frère-Omega Watch & Co. [3] [4] [5] In 1984, the company officially changed its name to Omega SA [6] and opened its museum in Biel/Bienne ...
The term chronometer is also used to describe a marine chronometer used for celestial navigation and determination of longitude. The marine chronometer was invented by John Harrison in 1730. This was the first of a series of chronometers that enabled accurate marine navigation. From then on, an accurate chronometer was essential to open-ocean ...
A simple mechanical watch, without the stopwatch functionality, can be certified a chronometer, as can a clock, for example a ship's clock, used for navigation. The terms are not mutually exclusive either, for instance the Omega Seamaster 300M Chronograph GMT Co-Axial is also a COSC certified chronometer [ 21 ]
The watches were small by modern standards and reliability issues resulted in Omega introducing watches based on the Lemania calibre 15CH (Omega 33.3) in 1933 at which point the 28.9 was slowly phased out of the range and had been discontinued by 1943.
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