The Breitling Watch Source Forums

Hi all,

Not sure if the answer to my question has been answered, but to those of you who know (or own) a Breitling with the B01 movement, what is the time deviation in a 24 hour period for a relatively new one? Both my Blackbird and Colt Automatic II are +4 seconds. I was curious as to what the deviation of the prestigious B01 in house movement is. I realize the deviation can vary depending on the age of the watch, but what's the avg.?

Thanks!

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Nick


Rolex Datejust 18K + SS

Navitimer 01 L.E.

It's COSC certified so -4 / +6 seconds per day. New watches will also take a few weeks to settle.

Roff,
At about what point does one say, "This is too much for settling to resolve?" I had a watch serviced/regulated and it is running 30ish seconds slow consistently after 1 week. I am assuming this is outside the range. Am I incorrect?

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SHARKMAN

30 seconds will likely be a problem with regulation. If the watch received a mechanical service then it will need to settle, and regulating during those first few weeks may be difficult as the settling may introduce errors - I'm pretty sure that your watch will still have an error in 3 weeks, but it may not be 30 seconds.

The problem with regulation these days is that it's done quickly against a timing machine and is not checked in various positions over a period of time. As a result a watch can run perfectly on the timign machine and not perform satisfactorily in the real world.

There is another thread on here somewhere, where a few of the guys with B01's have seriously praised it's accuracy. So while they are rated as -4/+6 (i.e. COSC) it seems the B01 is emminently capable of running better than that. That said, COSC spec is what Breitling will guarantee it to - i.e. if it's outside of that, they will regulate it FOC.

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Driver8

Site Moderator

I believe there were several people reporting -1/+1 a day on the B01.

My B01 was initially within +0.5 to +1 per day after it settled. However, I had (and still HAVE) a chronograph issue with the watch, so after it went to BUSA for repair, it came back to me running at -3 per day.

-Craig

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Chronomat 01- Sierra Silver/Steel
Navitimer 01- Limited Edition #1337/2000

Wow, that's more accurate than a Rolex superlative chronometer, which I believe is rated at -1+3 if I'm not mistaken.

Thanks for all the other replied guys.

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Nick


Rolex Datejust 18K + SS

Navitimer 01 L.E.

Don't confuse rated vs. observed.

The Breitling is COSC spec, so -4 / +6. Individual pieces can do better than that in some positions, some temperatures, some amount of reserve in the mainspring, etc, etc, etc.

As Roff said, rated is very different to observed. Rolexes are also COSC rated, so in that respect they are rated no differently to Breitlings.

It's worth noting that the "Superlative" moniker that Rolex use is no more than a marketing term. It doesn't remotely mean that Rolex's COSC certification is somehow better that Breitling's COSC certification. The COSC has one standard for all mechanical watches and that is -4/+6 secs per day.

Now obviously watches can exceed COSC requirements during normal use, but that is an observed figure rather than an officially rated figure. In other words, if your Chronometer rated watch (yes and a *ahem* "Superlative" Chronometer rated Rolex ) is running at +1 secs per day, it simply means that it's well within Chronometer specs. If your Chronometer rated watch is +7 secs a day, then it's not within COSC specs and needs regulating.

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Driver8

Site Moderator

After having used my Chronomat B01 more or less daily since about last christmas, and having it in for a calibration recently, it runs very consistently at about +0.5 secs daily if I let it rest dial down overnight (which is a"fast" resting position for this watch). I can nudge the rate back down slightly by leaving it in the crown down position over night and that way keep it pretty much spot-on.

When it was brand new, before it had settled in, it was not quite this consistent. But even then it would be regarded as very stable as mechanical watches go.

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"Either this man is dead or my watch has stopped!"
- Groucho Marx

I am using it daily since late January with the same results.

But why, if I may ask, did your B01 need a calibration Groucho?

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- This is Ghost Rider requesting a fly-by. - Negative Ghost Rider. The pattern is full.

Actually it didn't really need calibration, F14D_Tomcat. It was running within COSC specs, but erring on the minus side. I just prefer to err on the plus side. And I combined the calibration with getting the bezel brushed.

Good to hear that fellow squadron members are enjoying the same level of performance!

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"Either this man is dead or my watch has stopped!"
- Groucho Marx