This replica Seamaster 210304 blue 42mm wears the 210.30.42.20.03.003 reference and represents the core of the Diver 300M lineup in its most recognizable configuration. The 42mm steel case with blue ceramic dial and matching blue ceramic bezel has become one of Omega’s most photographed modern designs. Wave-pattern laser engraving on the ceramic dial catches light at different angles, and the broad arrow hands with SuperLuminova fill ensure legibility in low-light conditions.

Key Specifications

• Case diameter: 42mm
• Case material: stainless steel
• Bezel: blue ceramic unidirectional with liquid metal diving scale
• Dial: blue ceramic with wave pattern
• Crystal: domed sapphire with AR coating
• Bracelet: stainless steel with adjustable clasp
• Water resistance: 300 meters
• Functions: hours, minutes, seconds, date

The wave dial motif returned to the Seamaster line in 2018 after a period of flat dials, and this 210.30 reference was among the first to feature it. The pattern is polished into the ceramic surface rather than stamped, which explains its depth and reflectivity.

Design & Finishing

Blue Seamaster models consistently rank among the most popular in the Omega sport watch catalog. The 42mm diameter hits a sweet spot for most wrists, offering enough dial real estate without excessive lug-to-lug span. The helium escape valve at 10 o’clock and the conical crown at 3 complete the functional package. Compared to the Diver 300M 226150, this reference brings updated styling with the ceramic dial upgrade. The full Seamaster range includes variations in size and complication, but this blue 42mm version remains the entry point most buyers start with.

On the Wrist

The Diver 300M in blue occupies a space where sport watch meets everyday companion. The steel bracelet with its micro-adjust clasp allows fine-tuning on warmer days, and the 300m water resistance handles anything from pool swimming to snorkeling without hesitation. The date window at 6 o’clock keeps the dial symmetrical, a design choice that sets the modern Seamaster apart from its predecessors. This replica Seamaster 210304 blue 42mm puts that balanced design language on your wrist in the color that defined the modern Diver 300M generation.