Built around the 210.30.42.20.01.001 reference, this replica Seamaster 210304 black 42mm is the foundational model of the current Diver 300M range. Black dial, steel case, ceramic bezel. No two-tone accents, no chronograph complications. This is the Seamaster Diver in its most direct form, and it remains the single most popular configuration in the lineup. Omega keeps this reference as the entry point into the Diver 300M family, and it accounts for more wrist time than any other variant.

Technical Overview

• Case diameter: 42mm
• Case material: stainless steel
• Bezel: black ceramic, unidirectional, liquid metal diving scale
• Crystal: domed sapphire with anti-reflective coating on both sides
• Dial: black ceramic with laser-engraved wave pattern
• Bracelet: stainless steel with micro-adjust deployant
• Water resistance: 300 meters

The all-black-and-steel combination creates a monochromatic look that reads as serious rather than flashy. The wave pattern on the dial only becomes visible at certain angles, adding a layer of texture that photographs rarely capture.

Inside the Movement

The automatic caliber behind this reference uses co-axial escapement technology, which means the escape wheel contacts the pallet stones differently than in a standard Swiss lever. The practical result is less friction and a longer recommended service interval. Power reserve runs in the 55-60 hour range, enough to set the watch down Friday evening and pick it up Monday morning without resetting. View it alongside the green dial 210.30.42.20.10.001 for a direct color comparison within the Seamaster range.

What Sets It Apart

The black Diver 300M does not try to stand out. That is its advantage. It matches business attire, weekend clothes, and wetsuit with equal ease. Among dive watches in this size range, it competes directly with the Submariner for the title of most versatile tool watch. The helium escape valve, screw-down crown, and unidirectional bezel are functional, not decorative. Buyers who want one watch for every situation consistently land on this reference. This replica Seamaster 210304 black 42mm delivers that do-everything capability without a single unnecessary element.