The new 5303 COSC houses the chronometer-certified calibre M100, hence its name.

Once fully assembled, Serica's grand chronometer watches will endure more tests such as; re-controlling of their accuracy, power reserve tests, and shock-resistance to make sure that the watch that reaches your wrist is everything they have to offer.

The finish of the reference 5303 COSC constantly blends polished and brushed surfaces, whether circular, linear, or sunray. The construction and proportions shown truly brings life to the level of craftsmanship.

Including sapphire, enamel, and 316L stainless steel components, Serica have now added engraved polished high-density ceramic to the rotating bezel. Ensuring that the watch remains almost entirely scratch-proof.