At 41mm in stainless steel, this replica Seamaster Diver 300M 212304 reproduces the black-dial Diver 300M as it stood before the 2018 redesign. Reference 212.30.41.20.01.003 belongs to the Co-Axial Chronometer generation: a glossy black lacquered wave dial with the date at 3 o’clock, a black aluminium bezel insert with raised polished numerals, skeleton sword hands, and the red Seamaster Professional script that the current platform dropped. Buyers who find the 42mm Master Chronometer cases too modern in their proportions keep coming back to this one.

Key Specifications

• Case diameter: 41mm
• Case material: stainless steel
• Dial: black lacquered with wave pattern, date at 3 o’clock
• Bezel: black anodised aluminium, unidirectional, raised numerals
• Crystal: domed sapphire with AR coating
• Bracelet: stainless steel with folding clasp and ratcheting diver’s extension
• 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 is pressed into a glossy lacquered dial rather than ceramic, so it throws a wetter, deeper reflection than the matte ceramic surface Omega adopted later. Applied rhodium-plated indices stand above the dial surface, casting micro-shadows that add depth beyond what printed markers can achieve. The helium escape valve at ten o’clock is the cylindrical type with a knurled head, standing proud of the case flank. It is the detail that separates this generation fastest from the conical, flush-mounted valve on the 2018 cases. The aluminium bezel insert is anodised rather than ceramic, which is why long-owned examples of this reference develop a faded grey patina that a ceramic insert will never show. Compare this steel version against the two-tone 44mm 210.20 chronograph to see where the current Diver 300M range goes with sedna gold accents and three subdials. 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 clasp carries a ratcheting diver’s extension rather than the later micro-adjust system, so sizing out over a wetsuit sleeve is a pull rather than a click. 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 212304 is the reference that defined the Diver 300M for the fifteen years before the current range replaced it.