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Opened July 1999, zOwie is the Internet's first and longest running discussion forum dedicated to Omega brand watches.

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Re: To both Derek's,.......(more).
In Response To: To both Derek's,.......(more). ()

: 10 sec. All I'm asking is why did they
: decide on -4 to +6 sec/day? If they were

I think you've got the wrong idea here. The -4/+6 specfication is merely for the duration of the COSC test. It is a measure intended to determine that a brand new movement fresh from the factory and not yet assembled into a watch can meet an expected level of performance under specified conditions.

It is NOT a long term performance standard. So it is biased toward the expected condition of a new, not broken in movement.

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