The Breitling Watch Source Forums

Thks Roffensian...Anyway do u know during the COSC testing, the 5 positions with 3 temperatures per day, are the 5 positions in stationary form or the watch is always in motion in the 5 positions during the test? Because the test is for 15 days, do they fully wind the watch everyday or just keep the watch in motion to allow auto winding to take place throughout? Because I wanna know how do they determine the -4 +6 sec standard.

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Breitling Chronomat 01 Limited Edition
Breitling Navitimer 01 46mm

Methods are explained in great detail on their website - http://www.cosc.ch/

Also remember that COSC doesn't test watches, they test movements before casing up.

Thks for the info...So it's 5 stationary positions and they will wind the movement everyday. Actually from what I read from the website, there should be nothing wrong with my B01, especially when it has been rather consistent. At first my impression was that if the movement deviates more than -4 +6 Sec per day means that its not normal. But I guess the COSC testing method is not really that "merciless" afterall but rather it's the minimum benchmark that a chronometer has to meet before it is worthy of the name. In real life the way we handle and wear our watches will likely subject them to much harsher situations that can affect the accuracy of the movements. Correct me if I'm wrong;)

Anyway looking forward to own a Sub or GMT II in the near future. Will be keen to compare to see for myself physically how Calibre 01 fares as compared to other movements.

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Breitling Chronomat 01 Limited Edition
Breitling Navitimer 01 46mm

A COSC certified movement shouls still allow the watch to operate within specs in the real world. Yours isn't if it is consistently losing 10 seconds a day with anything other than a full power reserve so I would want it checked.

Ya I just e-mailed technical support and they suggested that I get it checked too. However I checked the watch again this morning after waking up and the accuracy was 100%. Lol...Anyway I also checked the Chronograph function yesterday and this morning. Basically no problem, except that I noticed the minute marker will jump to the next min a split sec before the the Sec hand sweep strikes 12. This means that if I stop the Sec Hand sweep at the 59.55 sec, the minute hand on the sub-dial will show 2min. So the reader might misunderstood the time taken to be 2min 59.55 sec although the time taken is only 1 min 59.55 sec. Do you or anyone know if this is normal?

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Breitling Chronomat 01 Limited Edition
Breitling Navitimer 01 46mm

I wouldn't be worried about that.

Ya that was what the technical support told me when I e-mailed them. they told me that it's due to the gaps in between the internal wheels and hence the hand will not jump exactly at 12. Anyway till now my B01 movement is still 100% accurate after the 10 sec loss per day on Mon and Tue. The time now at my country is 1.39am, Thurs. Wed morning till now is still 100% accurate.

Is there a need to always wind the watch fully before use everytime the movement has fully unwind or can I just wind about 20 turns? Cos I don't know if I need to do anything to allow the movement to "stabilise" especially for new pieces.

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Breitling Chronomat 01 Limited Edition
Breitling Navitimer 01 46mm

If you have average movement then it should maintain reserve over a 24 hour period, but may not be enough to add to the reserve. There's no downside to giving it a full wind so not sure why you wouldn't. Also not sure why you aren't getting hte watch checked - it may be perfect for 24 hours but the problem that caused it to be wrong by 10 seconds a day hasn't magically solved itself!!!

Lol...one reason is because I have seen many reviews of watches being sent in and end up having other problems when it comes back. So I prefer to send in when I am more affirmative that something is wrong. Will observe for a few more days because my first wedding anniversary is coming up on Christmas Eve so I wanna wear my dream watch on this special day before sending in for a check after that;)

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Breitling Chronomat 01 Limited Edition
Breitling Navitimer 01 46mm

It is a new movement with lot of problems. Better wait couple of years until all the teething problems are fixed. Mine was at AD already 4 times and still problems. Will go to ebay at loss I guess...

I disagree that it's a new movement with a lot of problems.
I have three of them in my collection and never had a problem and all three of them within 1-2 sec accuracy per 24 hours.
Either Im vey lucky or you are unlucky but Im very happy with my Breitling Cal 01 movements in my watches.

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"It is just a matter of time!"

Have you had any chronograph problems? When my chronographs are running the watch usually freezes up , then I hve to stop it and restart it, or give it a shake to start working again. When the chronographs are not running, the watch functions fine.

I'll be taking mine in soon...

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Nick


Rolex Datejust 18K + SS

Navitimer 01 L.E.

Yes chronograph stops suddenly and then starts after a strong shake (must be a gearing problem). When the watch is on the winder it looses 15 secs a day, on hand is better but still 10 secs. Stem is too wobbly when pulled out to maximum position and the minute hand engages after approximately 40 seconds (20 seconds more comparing to Caliber 13 7750. Great looking watch, maybe the movement will be refined. Rolex also had problems with new daytona movement and it is ok now. Nothing beats caliber 13, twenty years in my Old Nav II with only one service and consistently running +-3secs per day.

I have just sent in my Chronomat01LE for check as it loses 10 Sec per day sometimes. They found the amplitude to be low and will proceed to service my watch, for free of course. However I would say 80% of the time the watch's accuracy is almost 100%. Glad that yr calibre 01 is working fine. I was thinking if mine had been left with the AD for too long before I bought it cos the lubricants might have crystalized that obstructed the movement becos they didn't get the watch moving for too long. Or becos the jewels got dirty after sometime that affected the amplitude. Anyway that had not caused me to lose my favoritism for the watch. In fact I am happy that I had utilized the warranty! Lol...Hope that they will do a good job to service my watch. Their service had been excellent so far.

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Breitling Chronomat 01 Limited Edition
Breitling Navitimer 01 46mm