Citizen 9051, Instruction Manual

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7
English
Characteristics of Mechanical watches
About time accuracy of mechanical watches
The time accuracy described on this instruction manual is the static accuracy
at normal temperature. The accuracy of mechanical watches may get out of the
described range depending on the following three usage conditions or other reasons.
• Winding amount of the mainspring
• Attitude
• Usage environment (temperature, magnetism, impact, etc.)
Winding amount of the mainspring
Mechanical watches keep accuracy
most stably when the mainspring is
sufficiently wound.
Attitude
Accuracy of mechanical watches varies
affected by gravity. The accuracy varies
as the result that may take various
attitude while worn and gravitate to a
different direction every moment.