Mechanical and automatic watches should be cleaned and serviced every three - four years to ensure trouble-free time keeping. The moving parts of quartz watches also need maintenance, as they are not under tension and any small, foreign particle is sufficient stop them.
The battery needs to be changed when drained. This is the time for routine maintenance. Where water resistant seals are fitted, cleaning is required less often, however seals must be changed whenever the case back is removed. Otherwise they should be changed annually and resistancy checked using pressure equipement, through the manufacturers agent.
It is worthwhile remembering that regular exposure to chemicals, or sea water, can damage straps, plated cases, bracelets.
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