Certina DS Action Moon Phase - Blue - 42mm

COSC (Contrôle Officiel Suisse des Chronomètres) certification means the watch movement has been tested by the Official Swiss Chronometer Testing Institute and meets high standards of accuracy and reliability in various positions and temperatures.

You need to consult a current lunar calendar. Set the time first, then pull the crown to the position for date/moon phase setting and rotate it until the correct phase of the moon is displayed according to the calendar for the current date.

The watch has enhanced water resistance due to the DS concept. However, specific water resistance ratings vary. Always check the watch's rating and ensure the crown is secured before any water-related activity. It is generally recommended to avoid prolonged submersion unless rated for diving.

Automatic watches typically require servicing every 3-5 years to ensure optimal performance and longevity of internal components.

Yes, the leather strap can be replaced. You can typically purchase compatible straps from Certina or authorized watch retailers.

Warranty periods can vary by region and retailer. Please refer to the warranty card included with your purchase or contact the retailer for specific details.

Ensure the watch is adequately wound if it's automatic, or if it's battery-powered, the battery may need replacing. For automatic watches, extreme magnetic fields can affect accuracy; consult a professional for demagnetization.

The moon phase complication needs to be manually reset according to a lunar calendar. Consult the manual for the correct procedure for setting the moon phase based on the current date.

Ensure the crown is fully pushed in or pulled out to the correct position before attempting to turn it. If it remains stiff, do not force it; seek professional service.

Clean the strap with a soft cloth and apply a leather conditioner. Avoid prolonged exposure to water and excessive heat.