This discussion brings to light an interesting quandary for Omega, as legally speaking the term "chronometer" identifies clocks and watches that haven been tested and certified by the COSC. Which is why I left out the word chronometer when describing Omega's nomenclature for its new line of anti-magnetic movements. Chronometer is a term with a specific, legal meaning, and is not unique to Omega. "Master" and "coaxial" are unique to Omega in its nomenclature for watch movements. (To be clear, all Omega watch movements that are designated as 'master coaxial' or 'coaxial master' chronometers have in fact been tested and certified to the COSC standard).
There is an interesting article on Fratellowatches.com that touches briefly on the potential difficulty of making 'master chronometer' a special designation
https://www.fratellowatches.com/master-chronometer-explained-new-standards-by-omega/
"...you can only use ‘Chronometer’ when a movement has been tested and certified by the COSC. It is a protected name. Whether the combination, ‘Master Chronometer’, is a protected name is not entirely sure (probably there are some legal things pending at the moment)..."
I think that it is safe to assume that Omega regrets the awkwardness of its journey from 'master coaxial' to 'coaxial master', and wish they had gone with "coaxial, master chronometer" from the very beginning
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