Accuracy of time on my Rolex

[Robert Henley]

Another recent post prompted me to measure how much my Datejust was off timewise in the course of a day or a week. On Sunday, October 30 I set my Datejust in sync with my Atomic clock (to the second). It's now been six days, and my Datejust is exactly in sync with my Atomic clock. So you can't get much more percise than that. I bought my Datejust new in 1990, and have not done anything to it since I bought it in 1990. It has not been serviced.

I usually take my watch off for most of the weekends while I'm doing chores like the lawn, etc. So when I set my watch this past Sunday it had wound down quite a bit but was still running. After the first day, when I checked the time against my Atomic clock I was six seconds behind. After the second day, I lost two more seconds. Bear in mind that beginning on Monday, I would have been wearing my watch most of the day so it re-wound itself automatically. I then noticed on day three that it gained two seconds of the eight seconds I had lost and today, six days later, I'm back to dead even. So it looks like it gains a couple of seconds a day while it's wound up from wearing it.

So my question is what is considered normal time loss or gain in a day for a Rolex?

[dddrees]

-4/+6 average daily rate in accordance with COSC

[mrbill2mrbill2]

Originally Posted by Robert Henley

Another recent post prompted me to measure how much my Datejust was off timewise in the course of a day or a week. On Sunday, October 30 I set my Datejust in sync with my Atomic clock (to the second). It's now been six days, and my Datejust is exactly in sync with my Atomic clock. So you can't get much more percise than that. I bought my Datejust new in 1990, and have not done anything to it since I bought it in 1990. It has not been serviced.

I usually take my watch off for most of the weekends while I'm doing chores like the lawn, etc. So when I set my watch this past Sunday it had wound down quite a bit but was still running. After the first day, when I checked the time against my Atomic clock I was six seconds behind. After the second day, I lost two more seconds. Bear in mind that beginning on Monday, I would have been wearing my watch most of the day so it re-wound itself automatically. I then noticed on day three that it gained two seconds of the eight seconds I had lost and today, six days later, I'm back to dead even. So it looks like it gains a couple of seconds a day while it's wound up from wearing it.

So my question is what is considered normal time loss or gain in a day for a Rolex?

I wouldn't complain. It's keeping excellent time.

[HL65]

Doesn't get much better than that....

[316lad]

You lucky old thing - Mine is fast by an average of + 12 seconds a day.

I know why though -it needs a service.

It's going in next week - I'm just preparing myself to lose it for 12-16 weeks. That's not easy. But it has to be done.

[Bruno C]

-2 seconds per day.
Running so good!!

[threemonkeys]

-4.5 per day. Just off enough to drive me nuts.

[Darlinboy]

Haven't checked it lately, but I've not missed any happy hours, so it must be keeping good time.

[mrbill2mrbill2]

Originally Posted by Darlinboy

Haven't checked it lately, but I've not missed any happy hours, so it must be keeping good time.

Thank God! Missing Happy Hour is sacrilegeous!!

[kingSubTT]

+3/day.
Every week I pull the crown and stop it for 20 secs.

[316lad]

Originally Posted by kingSubTT

+3/day.
Every week I pull the crown and stop it for 20 secs.

And for that reason alone - it's better to be fast than to be slow.