It is a Sad Day for my Black Bay (GMT)...

I re-set the time on it last week after noticing that it was losing a fair bit of time.  It's down 90 seconds after 10 days with a movement that's not supposed to be outside COSC certifications of -4/+6.  I got the watch at the beginning of February, 2022, so it's not a time issue.  It's gonna have to go back to be re-regulated.  Sigh...

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Have you checked to see if it somehow got magnetized? That'd be the 1st thing I'd look at. You can get a compass and a demagnetizer on amazon for around $15

https://www.youtube.com/watch?v=DBxeIRnXyXQ

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Jklotz

Have you checked to see if it somehow got magnetized? That'd be the 1st thing I'd look at. You can get a compass and a demagnetizer on amazon for around $15

https://www.youtube.com/watch?v=DBxeIRnXyXQ

Magnetization would speed the watch up, not slow it down.

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Wow already ! 😢

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Fingers crossed it's an easy thing like magnetism.

Your AD might have a demagnetizer, too...

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JBird7986

Magnetization would speed the watch up, not slow it down.

The watch that I wore yesterday was magnetized and was running slow. Once I demagnetized it it began to keep accurate time again. Magnetization can affect accuracy in either direction.

Demagnetizers are cheap. They pay for themselves the first time that they make a difference.

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You can get a compass too just to check if it's magnetized and how badly. Note all metal objects will deflect a compass slightly but if it's magnetized it will deflect a lot more and a lot faster.

Typically, when a watch is magnetized, it should be noticeable within a few hours, not a few days. The Tudor movements have silicone balance springs though, so they should be pretty resistant to magnetization unless you're around some heavy magnetic fields (like right next to a big magnet or working in a lab).

The compass and demagnetizer are cheap so worthwhile investments regardless. Good luck!

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It's well within waranty period - might be worth a discussion about whether the warranty can be used to get it back in certification limits. 

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Jklotz

Have you checked to see if it somehow got magnetized? That'd be the 1st thing I'd look at. You can get a compass and a demagnetizer on amazon for around $15

https://www.youtube.com/watch?v=DBxeIRnXyXQ

It has got a silicon balance spring, I wouldn’t say it’s magnetization, but…15usd vs a trip to the AD…I’d buy it just to check

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Was the watch fully wound during that time, worn equal times in 5 positions and in controlled temperature rooms. Only then is the COSC spec -4/+6 seconds per day. A watch could lose 10s per day and be well within COSC parameters. 

Indeed even a METAS certified watch that is kept fully would at all times could lose 9 seconds per day and pass Master Chronometer standards. 

If the deviation is caused by non trivial environmental factors or wearing habits then regulating it might not solve it. Perhaps something to consider before sending it in.

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MegaBob

Was the watch fully wound during that time, worn equal times in 5 positions and in controlled temperature rooms. Only then is the COSC spec -4/+6 seconds per day. A watch could lose 10s per day and be well within COSC parameters. 

Indeed even a METAS certified watch that is kept fully would at all times could lose 9 seconds per day and pass Master Chronometer standards. 

If the deviation is caused by non trivial environmental factors or wearing habits then regulating it might not solve it. Perhaps something to consider before sending it in.

It was on a winder in a temperature controlled room for the duration.

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watch.this.feed

It has got a silicon balance spring, I wouldn’t say it’s magnetization, but…15usd vs a trip to the AD…I’d buy it just to check

Hmm, I wasn't aware it has a silicon balance spring. Learn something new all the time!

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JBird7986

It was on a winder in a temperature controlled room for the duration.

Well then off it goes for regulation 🥲

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Bummer! I hope Tudor can fix the issue quickly to reunite you with your awesome GMT asap. 

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This is why I'm interested in Vero watches. (No relation) They offer a no questions asked 10 warranty, with free regulation whenever the watch loses accuracy. A micro brand, yes, but based in the USA. 

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And she's off for warranty service and re-regulation...I reset the time on 11/1.  By yesterday (11/3) she was down 24 seconds.  Something's definitely off.