Montres Allison Rate Tolerances

Before a Montres Allison timepiece leaves the factory, the movement is tested in five different positions:

The movement is adjusted in each of these positions to an average rate of between 0 and +7 seconds per day. In other words, a Montres Allison timepiece must never be slow but may be fast by up to 7 seconds per day. The average daily tolerances for chronometer rates are between -4 and +6 seconds. This means that even a watch that loses up to 4 seconds a day can still be called a chronometer.

The rate is also affected by the owner's lifestyle. The mechanical movement will react differently when the wearer has an extremely active lifestyle from the way it would with a comparatively inactive person. However, any deviation from the tolerances mentioned above is not so much a question of function as of adjustment and wearing habits.

A watch may well behave differently after a repair.

 

 

 

 

 

 

 

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