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Old 11 April 2012, 12:49 PM   #16
dddrees
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Join Date: May 2010
Real Name: Dan
Location: USA
Watch: This N That
Posts: 34,251
You really didn't state how you are actually came to this conclusion that it is -3 a day.

So the best way to test is to make sure you first give your watch 40 winds to top off the power reserve and wear the watch anywhere from 8 to 10 hours a day. Although your Rolex is a self wind watch, typically most people will not do enough activity to actually top off the power reserve, so giving the watch a full 40 winds every other week typically is best. The watch will run more efficiently when the power reserve is topped off.

Set the watch to an accurate time source and then check the watch after 7 days. Since position, tempature, and other things can account for accuracy, it is best to check after at least 7 days of running the watch and average your result.

However if it is -3 seconds a day this is hardly anything to worry about as it is still well within COSC. COSC is after all between -4 and +6. After 30 days your still only 90 seconds off, which is pretty amazing considering this is a mechanical and not a quartz watch.
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