11/20/2023 0 Comments Timing watch clockMovements are tested uncased and under certain standardized conditions. This post explains how to measure that.Īccording to Frederique Constant, a tolerance –20/+20 is considered to be generally acceptable, and –7/+7 is considered to be excellent.Ībout 3% of the Swiss production earns the COSC chronometer certification, which means their movements are certified to operate within –4/+6. That does not mean your own timepiece will reach the extremes, however, could be the case that in practice it just gains around a couple of seconds. For example, if the specification of a model says it has an accuracy of –4/+6 seconds per day, that means it is going to deviate at most that much. The tolerance of a watch is given as the maximum amount of seconds per day it may lose or win. Mechanical watches are not exact, they keep time within a certain tolerance. Measuring mechanical watches accuracy Tolerances
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