This replica Seamaster 233904 pairs a blue sunburst dial with a 41mm case that sits in the sweet spot between dressy and sporty. The 233.90.41.21.03.001 reference belongs to the Seamaster Planet Ocean lineage, carrying forward the collection’s deep-sea heritage in a size that works equally well under a shirt cuff or on a rubber strap at the beach. Omega introduced this particular configuration with a titanium-and-gold case construction, giving it a noticeably lighter feel than full-steel alternatives while maintaining a premium visual presence.

Case & Movement Specs

• Case diameter: 41mm
• Dial: blue sunburst finish
• Bezel: uni-directional rotating with ceramic insert
• Crystal: domed sapphire with anti-reflective coating
• Bracelet: integrated metal bracelet with deployant clasp
• Movement: automatic Co-Axial
• Functions: hours, minutes, seconds, date at 3 o’clock

The blue dial on this reference catches light differently depending on the angle, shifting between deep navy and a brighter cobalt. The ceramic bezel insert resists scratching far better than aluminum versions found on older Planet Ocean models, and the luminous markers provide strong visibility in low-light conditions.

Caliber Breakdown

The automatic movement inside this 233.90 reference drives hours, minutes, central seconds, and a date window at 3 o’clock. The Co-Axial escapement design reduces friction between contact surfaces, which translates to longer service intervals compared to traditional lever escapements. For a closer look at how different Seamaster references handle deep-water specifications, browse the Seamaster collection. If you prefer a larger case with dual time zone capability, the 215.92 series at 46mm offers a more commanding alternative with GMT functionality.

How It Compares

At 41mm the 233.90 occupies the mid-range of the Planet Ocean lineup, smaller than the 45.5mm chronograph variants but larger than the compact 39.5mm models. The blue dial version stands apart from black and white options by offering a more versatile color that transitions between casual and formal settings. Buyers who want a Planet Ocean without the heft of a full-steel build will find this two-tone construction compelling. This replica Seamaster 233904 delivers a balanced combination of size, material, and color that covers a wide range of wearing situations.