Lady Datejust Running Slow

[oilydan]

My wife's little Datejust seems to be running slow, loses about an hour a day.

It went for a service about 4 months ago and came back OK....for a while, then went back once more to sort it out again, but now seems to be slow yet again.

It may be running out of power, it's hard to discern whether it runs out overnight or not.

I don't think the service included any parts, should I be looking at replacing the main spring? (1980's watch).

It was serviced at a specialist watch shop, not Rolex, as they would not touch it due to the aftermarket diamond bezel.

How long should it last once taken off? Surely it should not require resetting every morning?

Advice appreciated.

[Glideman]

A good repair should come with a 12 month warranty.

[JRewing]

Check it out with the shop which serviced it. It shouldn't stop overnight if it's worn throughout the day. Really I'd expect two days of running when off the wrist, unless the Lady Datejust has a much smaller power reserve than the male versions.

[oilydan]

I have taken it back and they have re-adjusted it. I has just reverted back to losing time.

The first time they told me that they adjusted how fast it runs, then the 2nd time told me that mobile phones, shop security devices etc can throw this out of whack. I don't think that is entirely true - if a shop security gate or mobile affected watches like that then everybody would be having problems (maybe that's whey everybody in the Middle East is always late!).

I think, for $100 or so I'm going to get them to fit a new mainspring, that seems to be the logical thing to do if it is not holding power?

[JRewing]

Push them until they give a proper diagnosis of the problem!