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Variation in Accuracy Questions; Please Help!

Finally settled to buy a SMP 300 (2531.80).

Bought it last Friday. Couldn't be happier with it, although I feel terribly selfish and materialist for having spent $2000 on something this futile...

I would appreciate some good advice as too the so-called "break-in period" and the accuracy or time variation I should expect from this chronometer.

When I got the watch of Friday, it was 21 seconds ahead of official US time. Today, exactly 72 hours later, it is a whopping 45 seconds ahead, which translates to +8 seconds per day since my purchase. This appears to exceed COSC standards. I do not quite worry as much as I am curious to find out whether this is normal and what could be the causes of that.

Is this normal? Usual?

Should I expect this to settle?

What is an acceptable standard (in real life) for a COSC certified automatic?

Thanks for your insight!

Regards,

Claude-Étienne
ceborduas@osler.com

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