zOwie Omega Discussion Forum

: I am curious as to why or how the same base
: movement is a certified chronometer in some
: watches, and not in others?

Certification is an entirely optional step. The movements themselves are not inferior or different--its simply a matter of whether they went through the official test or not.

These days, any new mechanical watch of fine brand which is properly adjusted should be able to meet the COSC specification. So the COSC certification of modern watches adds nothing more than one additional quality control check in the production process.

Some manufacturers go to the extra expense to have COSC certify their movements--mainly to be able to claim they are certified to make them more appealing to sell. Obviously, Omega is not concerned about being able to sell Speedmasters over their lack of COSC certification.

On the Omega Speedmasters, the Moonwatch was certified by NASA for use in space *without* the watches being COSC certified for accuracy. So obviously, it is not *that* critical if NASA is not concerned about it!