All SERICA watches offer protection against everyday magnetic fields. However, the Ref. 5303 provides a superior level of resistance thanks to a soft iron inner cage, allowing it to withstand magnetic fields stronger than 50,000 A/m. This makes it a

All SERICA watches offer protection against everyday magnetic fields. However, the Ref. 5303 provides a superior level of resistance thanks to a soft iron inner cage, allowing it to withstand magnetic fields stronger than 50,000 A/m. This makes it a particularly reliable tool in demanding environments. Other references in the SERICA collection, although not equipped with this cage, are still designed to resist common magnetic fields encountered in daily life (electronic devices, bags with magnetic clasps, etc.).<h4 id="to-avoid-in-all-cases">To avoid in all cases:</h4><ul><li style="font-family: Inter; font-size: 14px;">Prolonged contact with powerful magnetic sources (speakers, electric motors, industrial equipment).</li><li style="font-family: Inter; font-size: 14px;">Repeated exposure to intense fields, such as those generated by industrial scanners or MRI machines.</li></ul>A strong magnetic field can affect the accuracy of a mechanical movement. If in doubt or in case of unusual behavior (sudden gain or loss of time), our customer service is available to perform a quick and risk-free demagnetization of your watch.

Resistance to magnetic fields

All of our collections, with the exception of the Parade, are certified by the COSC (Contrôle Officiel Suisse des Chronomètres). What is the COSC?Founded in 1973, the COSC is an independent, non-profit organization recognized as a public interest bod

All of our collections, with the exception of the Parade, are certified by the COSC (Contr&#xF4;le Officiel Suisse des Chronom&#xE8;tres).What is the COSC?Founded in 1973, the COSC is an independent, non-profit organization recognized as a public interest body. Its mission is to test Swiss movements with absolute intransigence to award them the official title of &quot;Chronometer.&quot; Only 6% of exported Swiss watches obtain this label, a true distinction of the watchmaking elite.Extreme testing for total reliabilityEach movement in our watches undergoes a series of tests for 15 consecutive days. To obtain certification, the movement is tested in:<ul><li data-path-to-node="7,0,0">5 different positions (3 o&apos;clock, 6 o&apos;clock, 9 o&apos;clock, dial up, dial down);</li><li data-path-to-node="7,1,0">3 distinct temperatures (8&#xB0;C, 23&#xB0;C, and 38&#xB0;C).In total, 7 eliminatory criteria are analyzed, the most famous being the average daily rate. To be certified, the average daily rate of a mechanical movement must strictly fall between -4 and +6 seconds per day.</li></ul>The SERICA commitment: Beyond the standardThe COSC label certifies the movement alone (not yet cased). At SERICA, we go further to guarantee real-world performance on your wrist:<ul><li data-path-to-node="9,0,0">Soprod COSC Movements: We have chosen to collaborate with the Soprod manufacture to integrate the M100 calibers (for our 6190, 6190 M.S.L., and 5303 references) and C125 (for our ref. 8315), both meeting these standards.</li><li data-path-to-node="9,1,0">Additional internal tests: Once the watch is assembled in our workshop, we perform a second rate check in 6 positions on a calibrated measuring device. We thus ensure that every delivered watch statically respects chronometric tolerances.</li></ul>Can I check the accuracy of my watch myself?It is important to note that COSC certification tests are carried out under extremely strict laboratory conditions. Reproducing these results at home is complex because daily wear exposes the watch to variables (wrist movements, body temperature variations, light shocks) that differ from the static conditions of the tests. You can find the official measurement methods here: [<a target="_blank" rel="noopener noreferrer" href="https://www.cosc.swiss/notre-certification/methodes-de-mesure">https://www.cosc.swiss/notre-certification/methodes-de-mesure</a>]Watchmaker&apos;s note: Please note that external factors such as violent shocks, intense magnetic fields, or insufficient winding can influence the rate of your watch, even if certified. If in doubt, consult our article on accuracy diagnosis.

What is COSC certification and how does it impact my watch's accuracy?

Your SERICA watch is equipped with a high-precision self-winding mechanical caliber. This system uses your wrist movements to wind the mainspring. To guarantee its proper functioning and the longevity of its performance, here are the essential guidel

Your SERICA watch is equipped with a high-precision self-winding mechanical caliber. This system uses your wrist movements to wind the mainspring. To guarantee its proper functioning and the longevity of its performance, here are the essential guidelines to follow:<h4 data-path-to-node="5" id="influencing-factors-and-accuracy">Influencing factors and accuracy</h4>Several external elements can disturb the regularity of the balance wheel and generate measurement discrepancies:<ul><li data-path-to-node="6,0,0">Shocks: Whether direct or indirect (intense vibrations, impact sports), they can affect the delicate components of the movement.</li><li data-path-to-node="6,1,0">Magnetism: Exposure to significant magnetic fields (smartphones, speakers, security gates) is the #1 cause of a movement suddenly gaining excessive time.</li><li data-path-to-node="6,2,0">Temperatures: Sudden changes in temperature can influence oil viscosity and expand certain components.</li></ul><h4 data-path-to-node="7" id="handling-and-safety-guidelines">Handling and safety guidelines</h4>To preserve the integrity of your mechanism, please strictly observe the following instructions:<ul><li data-path-to-node="8,0,0">Manual winding: If your watch has stopped, unscrew the crown and perform about 30 manual turns to restart the spring with the necessary torque before putting it back on your wrist.</li><li data-path-to-node="8,1,0">Water resistance: Never manipulate the crown (winding or time setting) when the watch is submerged or in contact with water. Ensure the crown is perfectly screwed back down before any immersion.</li><li data-path-to-node="8,3,0">Screwing the crown: When screwing it back in, do not exert excessive force. If you feel unusual resistance, unscrew slightly to realign the threads and screw back in gently.</li></ul>

How to ensure optimal power reserve for your automatic watch?

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An insight into our movements and our precision standards.

MECHANICAL PERFORMANCE

CARE AND PRECISION

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Where to find the serial number of your SERICA watch?

CARE AND MAINTENANCE

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How do SERICA diving chronometers’ bezels operate?

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SERICA Warranty: Duration, Coverage, and Exclusions

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How does SERICA guarantee its movement precision and certification?

GUARANTEE

When should i really worry about a potential accuracy problem with my chronometer movement?