Seamaster Diver 300M Sedna™ Gold Co-Axial Master Chronometer 42mm

Seamaster Diver 300M blends contemporary Swiss engineering with refined elegance through the combination of stainless steel and exclusive 18K Sedna™ Gold. Its 42 mm case is complemented by a deep blue ceramic dial featuring laser-engraved wave patterns, a signature design that has defined the Seamaster collection since its modern revival.

The polished Sedna™ Gold hands, indexes and bezel accents create a striking contrast against the rich blue tones, while the unidirectional ceramic diving bezel enhances both functionality and visual appeal. Designed for professional diving yet refined enough for everyday wear, the Seamaster remains one of the most versatile luxury sports watches in Swiss watchmaking.

The Co-Axial Master Chronometer Calibre 8800 delivers outstanding precision, exceptional magnetic resistance and proven reliability. Paired with a comfortable blue integrated rubber strap, this model perfectly balances technical performance with timeless sophistication.

42 mm stainless-steel and 18K Sedna™ Gold case

Blue ceramic dial with laser-engraved wave pattern

Blue ceramic diving bezel with Ceragold™ scale

Co-Axial Master Chronometer Calibre 8800

METAS-certified precision

Automatic movement

Domed sapphire crystal with anti-reflective treatment

Transparent sapphire caseback

Screw-in crown

Helium escape valve

Anti-magnetic to 15,000 gauss

Water resistance to 300 metres

Powered by the Co-Axial Master Chronometer Calibre 8800, this self-winding movement represents the latest generation of mechanical innovation. Certified by METAS, it guarantees exceptional precision, magnetic resistance up to 15,000 gauss and long-term reliability under demanding conditions.

The movement incorporates Co-Axial escapement, free-sprung balance with silicon balance spring and twin-direction automatic winding system, delivering approximately 55 hours of power reserve. Its refined finishing can be admired through the transparent sapphire crystal caseback.

Reference: 210.22.42.20.03.002

Collection: Seamaster Diver 300M

Movement: Co-Axial Master Chronometer Calibre 8800

Type: Automatic

Certification: METAS Master Chronometer

Power Reserve: Approximately 55 hours

Frequency: 25,200 vibrations per hour (3.5 Hz)

Case Diameter: 42 mm

Case Material: Stainless steel and 18K Sedna™ Gold

Case Thickness: 13.6 mm

Crystal: Domed sapphire crystal with anti-reflective treatment

Caseback: Transparent sapphire crystal

Bezel: Unidirectional diving bezel

Bezel Material: Blue ceramic with Ceragold™ diving scale

Dial: Blue ceramic with laser-engraved wave pattern

Functions: Hours, minutes, seconds, date

Helium Escape Valve: Yes

Water Resistance: 300 metres (30 bar)

The watch is fitted with an integrated blue rubber strap, designed to provide exceptional comfort, flexibility and durability in both everyday wear and professional diving environments.

Its textured finish complements the blue ceramic dial and bezel while creating a modern sporting appearance. Secured by a stainless-steel folding clasp, the strap offers a lightweight and comfortable fit that perfectly matches the Seamaster's versatile character.