Is it safe to leave your chrono running all the time?

I have seen some do this on their ROO. What about the others? Piguet based like RO chrono/Blancpain chrono...el primero based...Rolex Daytona...Lemania based VC/Patek/RD/Breguet...etc. Can anyone shed a light? Thanks!

p.s. Chronograph can be used to mark a second time zone while we're overseas, however the chrono MUST run at all times.

It depends on the type of chrono
03/25/2008 - 04:01

Rei, below is a copy of a post I made a while back:

... if the chronograph uses a vertical clutch mechanism (ie: the chronograph driving wheel is constantly running even when the chrono hand isn't; a clutch mechanism "lowers" or "raises" a contact to that chronograph wheel which makes the hand move or not), then you can use the chronograph hand as a continuously running seconds hand without any losses of time keeping qualities. Actually, some say you should use it like that for better running of the watch and for the long term running fo the watch too.

If it is not a vertical clutch, then you should NOT use the chrono all the time as you would get loss of balance amplitude with the additional load brought on by the chronograph mechanism being brought into motion.

So you need to check which type you have. The vertical clutch is a more recent invention (well, 20-30 years at least I think). So if you have a very old watch, chances are it is not a vertical clutch.

Hope this helps.

Hi Nico, thanks for your reply.
03/25/2008 - 11:40

I have 2 chronographs: RO chrono which uses piguet mov't like used in Blancpain and Malte chrono which uses lemania 27. I suppose both are vertical clutch? Thanks again. 

the Lemania based chrono is horizontal clutch (nt)
03/25/2008 - 11:45


this is what a watchmaker says about this...
03/25/2008 - 09:15

Curtis Thomson talks about the continious running of the chronograph: click here to see the post

IC. Different opinion...thanks Alex. (nt)
03/25/2008 - 11:45


well, they're not really different.
03/26/2008 - 01:10

No matter what, running something in a watch creates wear. Many functions are simply running all the time and you live with the wear (calendars, etc...). The chrono function however is a choice and that's where the difference is.

Cortis still makes the big difference between horizontal and vertical clutch. Personnaly I would run a vertical clutch while I wear the watch and not run it while I don't wear it for example, or one day on, one day off (I have never been a fan of chronos so I don't have one). It is mostly the starting and stopping of the chrono which is bad for it, so that should not be something you do all the time.

Understood. I will try to follow your suggestion.
03/26/2008 - 03:46

Thanks Nico. So once I start the chrono better let it run for the time frame I wish to use it for, rather than clicking on and off few times a day.'s my 200th post. This makes is 201st :D (nt)
03/26/2008 - 03:47


good job Rei :-) (nt)
03/26/2008 - 10:53


Merci! :D (nt)
03/26/2008 - 12:58