Based on the Planet Ocean 600M reference, this replica Seamaster 210304 blue 44mm blue 44mm pairs a deep blue dial with a 44mm stainless steel case and a matching blue ceramic bezel insert. The 210-series designates the current-generation Planet Ocean, which moved to a thinner case profile compared to the earlier 215-series chronographs while retaining the 600m water resistance rating that defines the sub-line. The blue dial carries applied luminous indices and a date window at 6 o’clock, following the modern Seamaster layout convention.

Technical Overview

• Case diameter: 44mm
• Case material: stainless steel
• Dial: deep blue with applied luminous markers
• Bezel: unidirectional, blue ceramic with liquidmetal scale
• Crystal: domed sapphire with anti-reflective coating
• Bracelet: stainless steel with adjustable diver’s clasp
• Movement: automatic co-axial
• Functions: hours, minutes, seconds, date, uni-directional dive bezel

The blue ceramic bezel insert resists scratching and UV-driven color fade, maintaining the original shade across years of daily wear. The liquidmetal numerals are injected into the ceramic rather than printed, creating a flush surface.

Inside the Movement

Omega’s co-axial escapement in the genuine 8900-series caliber uses a free-sprung balance with silicon components for anti-magnetic performance. The automatic winding system provides a stated 60-hour power reserve in the genuine movement. At 44mm the Planet Ocean targets wrists that can carry a substantial dive case without the watch appearing oversized. The blue-on-blue bezel-and-dial combination reads as more cohesive than the black-bezel-blue-dial options seen on some competing dive watches. For a green-dial take on the Seamaster in a smaller case, see the green 41mm 220.10.41.21.10.001 from the Aqua Terra family. Both models belong to the Seamaster collection, but the Planet Ocean emphasizes depth rating over dressy versatility.

What Sets It Apart

Blue dive watches have become a category staple, but the Planet Ocean’s specific shade sits darker than the turquoise spectrum and lighter than navy. It reads differently depending on depth and angle, shifting from royal blue in direct light to near-black in shadow. The 44mm case fills the wrist confidently, and the bracelet’s micro-adjust clasp lets you fine-tune the fit without tools. This replica Seamaster 210304 blue 44mm blue 44mm delivers that saturated-blue dive aesthetic that photographs as well as it wears.