question about Overseas chrono....

As I saw in another forum i will like to know your opinions on leaving the chrono running 24/7.

I like to see that seconds hand movequestion about Overseas chrono........but is it good for the reliability of the watch?? 

I'm curious of your expert coments...


Re: question about Overseas chrono....
12/11/2007 - 19:26

In general, for an automatic watch, to preserve the exactitude of the hour, it's recommended to keep the watche into a watchwinder or on the wrist!

The movement is consequently requested more and it wears more quickly.

spoke to a watchmaker (not at VC) who told me that having the chrono
12/11/2007 - 22:40

running 24/7 would lead to premature wear on the movement parts, there could also be a loss in amplitude in the long term causing loss in accuracy.

I am not sure it is true in this instance
12/12/2007 - 01:46

Oveseas uses F.P 185 chrono movement which is a vertical clutch construction. With vertical clutch, the chrono second wheel is always turning anyway. The clutch engages or disengages the chrono hand and no additional wear when the hand is engaged. Actually it loses some amplitude when the hand is NOT running due to friction by the vertical clutch to stop the second hand.  Rolex's new chrono in Daytona is also of vertical clutch design, so is the movement used in PP 5960 and 5980. 

With Malte chrono which uses a lateral clutch design, it is not recommanded to run chrono constantly due to extra wear and loss of amplitude when the chrono is engaged.  My Les Historique actually slows down if the chrono is running for an extended amount of time.

I also spoke to a watchmaker who was of the same opinion...
12/12/2007 - 04:49

that it would unnecessarily lead to premature wear and tear on parts.  He said the chrono function should be used when needed, but he did not feel it was good to leaving it running 24/7 simply so a person can see all the hands move. 

Best regards,


Re: spoke to a watchmaker (not at VC) who told me that having the chro
12/12/2007 - 21:35

Hi Alex,

While there are different implementations, with varying effects, it is my opinion that you shouldn't run the chrono 24/7.  That is, some chronos may show minimal additional wear and some may show greater wear depending on their construction if used continuously, but there will be premature wear nonetheless.   To be more specific, the "playing" with the chronograph will certainly cause premature wear to the functional faces of levers, hammers, correctors, jumpers, etc. on any chronograph.  And, while I have not put this to the test, I would imagine the power reserve could suffer if the chrono was to run continuously.  Regarding amplitude issues, these are real when speaking of non vertical clutch chronos, which is to say, most mechanical chronographs.  The greatest cause of premature wear in a chronograph is when it isn't adjusted properly - whether from the factory, after-sales service, or by an independent watchmaker.

It is a safe bet to follow the given manufacturers guidelines for the use of their watches.



fantastic Curtis! Thank you for the enlightening explanation (nt)
12/12/2007 - 22:25


Re: question about Overseas chrono....
12/11/2007 - 23:54

thanks...if I understand well it's better to slow down the use of the chrono function, sorry to heard that!

I heard that only Daytona 4130 Rolex is able to be running all time without damaging the mecanism...