At 42mm in stainless steel, this replica Seamaster Diver 300M 210304 delivers the foundational black-dial configuration of the current Diver 300M generation. Reference 210.30.42.20.01.001 is the entry point into Omega’s modern Seamaster Diver platform: black ceramic dial with wave-pattern engraving, black ceramic bezel insert, and a steel bracelet with the integrated micro-adjust clasp. This is the reference that most buyers encounter first when exploring the Diver 300M range, and it has remained the best-selling dial color in the family since the 2018 redesign.

Key Specifications

• Case diameter: 42mm
• Case material: stainless steel
• Dial: black ceramic with wave pattern
• Bezel: black ceramic unidirectional
• Crystal: domed sapphire with AR coating
• Bracelet: stainless steel with micro-adjust clasp
• Water resistance: 300 meters
• Helium escape valve at 10 o’clock
• Functions: hours, minutes, seconds, date

The black-on-black combination maximizes contrast against the white-filled hour markers and hands, producing the highest legibility of any dial color in the 300M lineup.

Design & Finishing

The wave pattern across the black ceramic dial picks up ambient light and creates moving lines that shift with wrist movement. Applied rhodium-plated indices stand above the dial surface, casting micro-shadows that add depth beyond what printed markers can achieve. The conical helium escape valve at ten o’clock sits flush with the case contour in the current generation, where earlier Seamaster 300M designs used a more protruding cylindrical shape. The seamaster 300m black ceramic dial offers better color stability than painted alternatives, resisting UV degradation over years of exposure. Compare this steel version against the chronograph-equipped 210.20 Seamaster to see how the platform scales up with additional complications. Both live in the Seamaster catalog.

On the Wrist

Black-dial dive watches remain the default choice for a reason: they pair with virtually anything and transition from office desk to boat deck without a strap change. The steel bracelet adds wrist presence that titanium versions trade away for comfort, and the polished center links provide light reflection that catches the eye in a way brushed-only surfaces cannot. The micro-adjust clasp lets you fine-tune fit on the go, accommodating wrist swelling in warm weather without tools. For buyers who want one Seamaster Diver to serve every role, the black-dial steel configuration covers the widest ground. This replica Seamaster Diver 300M 210304 is the anchor reference that defines what the modern Diver 300M range is built around.