seamaster Professional chronometer

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Hello dear members,

To build up my Omega knowledge, I was looking at seamasters pictures around year 2000 and I notice one marked
"Seamaster Professional Chronometer".
To appreciate the differences between models, Does someone can tell me what is behind the words"professional" and "Chronometer"?
Thanks
 
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I think professional is just a naming. And chronometer is a certification given to watches that upheld the standard given by COSC