Cal. No. 9051
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Before using this watch
Accuracy of a mechanical watch
The accuracy of a mechanical watch on the specification page is static accuracy at normal temperatures. Accuracy of a mechanical watch may not be kept within a normal accuracy range due to using conditions such as below.
- Winding amount of the mainspring
- Posture of the watch
- Usage environment (temperature, magnetism, shock, etc.)
Winding amount of the mainspring
A mechanical watch keeps its accuracy best when its mainspring is sufficiently wound.
Posture of the watch
Accuracy of a mechanical watch varies affected by gravity. The accuracy varies as the result that the watch may take various attitude while worn and gravitate to a different direction every moment.
Usage environment (temperature, magnetism, shock, etc.)
- Metal parts are used for the part for keeping accuracy in a mechanical watch. The accuracy varies affected by their thermal expansion and contraction.
- Metal parts are used in a mechanical watch. Magnetism affects them and accuracy of the watch in consequence. Do not bring it close to things which have or generate strong magnetism.
- Strong shocks may also affect the accuracy.