Reference 210.30.44.51.03.001 is the Seamaster Diver 300M Chronograph in blue on a full steel bracelet: a 44mm stainless steel case, a blue ceramic bezel insert with Liquidmetal scale, and a blue wave dial carrying two chronograph registers. This is the chronograph tier of the Diver 300M, not a Planet Ocean. The dial reads 300m / 1000ft, the helium escape valve sits at 10 o’clock, and the date aperture falls between 4 and 5 o’clock where the subdial layout leaves room for it.

Technical Overview

• Case diameter: 44mm
• Case material: stainless steel
• Dial: blue with wave pattern and two chronograph registers
• 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 chronograph
• Water resistance: 300 meters
• Functions: chronograph, hours, minutes, seconds, date, helium escape valve

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 9900-series chronograph 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 Diver 300M Chronograph targets wrists that can carry a substantial 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 chronograph emphasizes timing function over dressy versatility.

What Sets It Apart

Blue dive watches have become a category staple, but this Diver 300M 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 Diver 300M Chronograph in blue delivers that saturated-blue dive aesthetic that photographs as well as it wears.