Breitling: losing a minute a week - acceptable?

[Redmax]

My Breitling (sorry, can’t remember exactly which model. It’s the one with their movement, B something, GMT something, it’s a chronometer. I can post a pic if it matters) is losing at least minute a week. This feels like quite a lot, but is it within ‘tolerance’?

Assuming it’s not acceptable and it needs to go into a workshop, what would they actually do to adjust/correct it?

Thanks

Jason

[romeodelta]

-8 secs a day is outside COSC tolerance, but not terrible.

Depends on the age, service history etc.

Probably just needs servicing. I'm sure there are people around here who can help with that.

Edited by romeodelta on Tuesday 14th January 23:07

[seadragon]

I'm not an expert, but maybe check if it has been magnetised. Download the Lepsi app. Can't do any harm

[davek_964]

seadragon said:

I'm not an expert, but maybe check if it has been magnetised. Download the Lepsi app. Can't do any harm

I may be wrong, but I thought that usually made them run fast (it did mine)

[Ninjin]

davek_964 said:

I may be wrong, but I thought that usually made them run fast (it did mine)

You are right. A magentised watch usually runs fast due to the mainspring getting tighter due to the magnetism.

[AJB88]

Has it ever been serviced? if not will be worth getting it done.

[Redmax]

Thanks guys. It hasn’t been serviced as it’s only a couple of years old. It’s had a hard life though so I’ll get it booked in for some TLC.

[T6]

Redmax said:

Thanks guys. It hasn’t been serviced as it’s only a couple of years old. It’s had a hard life though so I’ll get it booked in for some TLC.

If not still under warranty, then a goodwill gesture should be in order.

My Superocean hasn't been touched since I bought it 8 years ago, and gains 5 secs per week - But that's what you get with an ETA 2824 bagoste movement thrown in.

[PJ S]

Might be nothing more than needing regulated.
A timegrapher, which displays the amplitude, will give a better idea of the state of health of the movement.

What you can do is rest the watch in different positions overnight (assuming you take it off), and see which make it run fast, thereby countering the slow running whilst on your wrist.

Positions are:
Dial up/down
Crown up/down
12 up/down

Check against time.is, note the difference, then do the same next morning before putting it on.

One thing that can cause the watch to be off is the state of wind in the mainspring. If you’ve very little, and you’re not that active during the day, then isochronism comes into play.
So, before resting it overnight, give the crown a good 30 full turns to ensure it’s well wound.