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Originally Posted by Rob1963
Hi, it's Rob again. Can I also please ask if someone could advise me on how exact Rolex's time keeping is. I'm losing up to 5 secs a day which I didn't really expect. Is this normal?
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No mechanical movement any make any price is going to be spot on accurate.There will be always slight daily deviations.The set COSC standard is a average of -4 to +6 over 24 hours.Try resting you watch off wrist at night flat dial up might gain a few seconds.Remeber its mechanical and in 24 hours, the escapement of a mechanical watch pushes the gears 432,000 times. Since a day has 86,400 seconds, even a watch that runs five minutes fast or slow each day has an accuracy of over 99.6 percent! A finer mechanical watch that gains or loses about six to nine seconds a day or about a minute a week has a breathtaking precision of over 99.99 per cent. This is very high precision, given the fact that the movement is constantly affected by the earth's gravity, metal expansion and contraction, temperature variations, subtle changes in lubrication and friction, shocks, and so on.Its a simple fact no mechanical watch made will keep 100% perfect time, very close yes but perfect no.