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The vast, vast majority. The 7750 type movements and all the ETA based ones I am aware of are that way. Which means pretty much everything except some, not all, of the more costly in house movements.

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SHARKMAN

It's not strictly an in house / non in house thing, the Cockpit has instant date change for example.

The issue is really one of torque in the movement - remember that the entire watch is powered by a single spring (generally - some in house movements have multiple mainsprings) and asking the same power source to provide a lot of power to suddenly move heavy (relatively) date wheels instantly while still maintaining accurate timing through the running train can be a tough problem to solve. It's far easier to make the date change a more gradual change over an extended period of time which results in the date change wheels being partially engaged with the running train for an extended period and it's the use of the quickset during this partial engagement that can strip or bend teeth.

So...this seems to strengthen my point that through engineering, they have found a way to fix the 8-3 "problem" Perhaps i should get rid of my B4B and get a watch with an instant date set feature.

Thanks for the info. Sorry to ruffle feathers.

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Jibba
Rolex DeepSea | Rolex Sub C-LV | Panerai PAM 111

That's an oversimplification.

The Cockpit can do it more easily because:

a) multiple date wheels reduce the torque need
b) there doesn't need to be an allowance for a chronograph and the torque demands that would make

The date on a Breitling in house movement can be changed at anytime. I can't speak to EVERY in house movement on the market but with a Breitling B01 you can change the date at anytime.

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"I don't own any watches, I just lease them"

Note to self;

Do not adjust time on smartphone underwater between 8 and 3.

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Al

“Quis custodiet ipsos custodes"

It can but my AD advised me against it anyway (if I can avoid it) because being an old watchmaker he finds that possibility risky anyhow.

Having said that, I do not understand why it's so difficult to only move the time forward (and not backwards) if your watch has stopped to set it properly and avoid using the quick date change.

Except of course if the watch has stayed put for a few days, in which case that method will be time consuming. But you won't have to care about the danger zone.

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

Because mechanically winding time backwards is causing the same movement of the wheels relative to one another and risking stripping or bending teeth.

If you wind time forwards then all you are doing is accelerating the natural actions within the movement and therefore causing the date wheel to fully engage before moving.

Apparently my English has completely failed me in this thread, so let me try again.

I said move the time forward not backwards.

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

Right, but I thought you meant that you didn't understand why it couldn't be moved backwards, so that's what I tried to explain.

Perhaps it's my English.

Correction, only adjust time on your smartphone underwater FORWARD between 8 and 3.

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Steelfish GMT LE (white)

I'm picturing a first time Breitling owner searching this site to learn about the 8-3 rule and coming upon this thread first.

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SHARKMAN

I'm afraid to ask this " newb" type question here especially on this thread but here goes: Can the time be wound backwards outside of the 8-3 danger zone?

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Regards,

Peter

BREITLING for Bentley Motors T & Mark VI, Aerospace
ROLEX Submariner Ceramic116610LN
OMEGA Plantet Ocean 8500 42mm Orange arabics
OCEAN7 LM-3

Yessssssssssssssssssssssssssssssssssssssssss.

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SHARKMAN

At my age I would risk winding time backwards

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Al

“Quis custodiet ipsos custodes"