Similar "issue" with my VC Les Historique Chrono

Both watches use the same base ebauche Lemania Ch 27. I believe it is the inherent short coming of a lateral coupled chronograph design and it is the loss of amplitude when the chronograph second is engaged. With this three things will happen:

1) The accuracy is affected when the chronograph is engaged

2) The watch stops earlier when there is not enough energy to drive the additional chronograph gears

3) Additional wear and tear of the watch

I won't get into the details but the superiority of a vertical clutch design (as in 5960 and 5980) is that there is no loss of amplitude when the chronograph is engaged and very little additional wear and tear if at all hence the chrono in 5960 and 5980 is designed to be run constantly. The problem with this movement is that with automatic rotor and clutch plate much of the parts is hidden therefore not as beautiful to look at as a lateral coupled movement in your 5970.

My suggestion is to enjoy your watch but don't engage the chrono function too often.

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A Patek 5970 chronograph issue.......

By: michael5 : March 4th, 2008-08:27

Hi Everyone Having worn my 5970 every day for nigh on a month I was very impressed at its accuracy – I think it lost about 4 seconds over the whole period. Then a few days ago I noticed, while having the chrono running, that it had lost 30 minutes. Thinki...

I will make the same experiment..and let you know...regards

By: chronoman19 : March 4th, 2008-08:59

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I am a relative novice here, so please forgive my ignorance. Your post in response to the VC chrono question really surprised me. I was under the impression that PP produced ALL of its own movements, so the fact that the PP model you mentioned starts with...

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