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Mechanical watches
About accuracy
The accuracy of mechanical watches in this instruction manual is static accuracy at
normal temperatures.
The accuracy on the specifications may not be kept depending on the following
conditions of use:
• times the mainspring is wound
• position
• usage environment (temperature, magnetism, impact, etc.)
Times the mainspring is wound
Full winding of the mainspring ensures the most stable and accurate movement of
mechanical watches.
Position
When you wear the watch on the wrist, the position of the watch changes frequently,
and the movement of the watch is influenced by changes in the direction of gravity. This
affects accuracy of mechanical watches.
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Usage environment (temperature, magnetism, impact, etc.)
• Because mechanical watches use metal in parts for keeping accuracy, changes in
temperature, which cause metal to expand and contract, will affect the accuracy of the
watch.
• Because mechanical watches use metal parts, exposure to magnetic fields affects
their accuracy. In order to keep the watch accurate, do NOT subject it to strongly-
magnetized objects.
• Strong shocks also affect the accuracy.
Maintenance
Mechanical watches may become inaccurate due to insufficient lubrication or wear.
Have the watch disassembled and cleaned (overhaul) every 2-3 years (charge basis).
It may be difficult to restore the watch from degradation after long-term use to its initial
performance even after repairs.
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