GMT Precision

[Quicksilver]

Sorry to start yet another thread about accuracy....but here we go.

The issue is one of precision rather than accuracy. My 2003 GMT was very precise until it went in for a service last year when it came out behaving quite erratically. It went back into Rolex who "observed" it for a week or two and then declared that they were happy with it. They set it to run at + 2 but it soon ran at -3. I took it in to be regulated and they set it at +2 again but it started running at + 6.5. But it seemed to be precise at least, running pretty much at about +6.5 daily.

A few weeks ago I decided to check on its progress by measuring it weekly.

Week 1 - it gained 3.5 seconds (an average of + 0.5 per day).
Week 2 - it gained 18.5 seconds (an average of + 2.64 per day).
Week 3 - it gained 36 seconds (an average of + 5.14 per day).

My wearing patterns are the same every day and I lay the watch crown up every night.

I am now going to try daily measurements.

That's quite a variation. It's only a 2003 model and its just been serviced. Is it to much to ask that it should be precise and show pretty much the same degree of variation daily? I know it's running within COSC but the weekly fluctuations are concerning.

Or am I being over fussy?

Also, I wonder what could cause these fluctuations?

[The GMT Master]

How often do you manually wind the watch?

[Quicksilver]

Originally Posted by The GMT Master

How often do you manually wind the watch?

I don't have any regular winding habits, Chris.

At first I was hardly winding at all and just letting it run on reserve.

The past couple of weeks (since monitoring its performance) I have been winding more frequently - probably on average about once every 3 days. But I think I wound it 4 or 5 times over the past 7 days as I have found myself fiddiling with the watch in the evenings.

Could this be the cause ?

[The GMT Master]

Originally Posted by Quicksilver

I don't have any regular winding habits, Chris.

At first I was hardly winding at all and just letting it run on reserve.

The past couple of weeks (since monitoring its performance) I have been winding more frequently - probably on average about once every 3 days. But I think I wound it 4 or 5 times over the past 7 days as I have found myself fiddiling with the watch in the evenings.

Could this be the cause ?

Hmm, if you're keeping the power reserve topped up, it should be as stable as it can be, it's only when it gets to the bottom of its power band when it starts to act a little more erratically. I honestly don't know what could be causing it, really

[Quicksilver]

Originally Posted by The GMT Master

Hmm, if you're keeping the power reserve topped up, it should be as stable as it can be, it's only when it gets to the bottom of its power band when it starts to act a little more erratically. I honestly don't know what could be causing it, really

Hmmm...very odd. I think I will keep it under close observation for a couple of weeks to see if it settles down. I have a two year guarantee on the service so plenty of time to take it back. It's also been running non-stop since August - perhaps I should let it run down, leave it for a day or two and then power it up again and see if that makes a difference.

[World Time]

For Rolex its ok until 5 minutes per mounth. This is 10 seg per day
Your rolex its ok now

[Quicksilver]

Originally Posted by World Time

For Rolex its ok until 5 minutes per mounth. This is 10 seg per day
Your rolex its ok now

But shouldn't it be showing the same rate of gain or loss per day/week? It's within spec but it's the wide variations in the rate of gain that I find puzzling.