At 44mm with a two-tone rose-gold-and-steel construction, this replica Seamaster 210204 black black takes the Planet Ocean into mixed-metal territory. The black dial and black ceramic bezel create contrast against the Sedna gold mid-links, crown, and bezel surround that Omega uses on the genuine 210.20 references. Two-tone dive watches are uncommon, and the gold-and-steel approach gives the Planet Ocean a visual weight that full-steel versions at the same diameter do not carry.

Key Specifications

• Case diameter: 44mm
• Case material: stainless steel and Sedna gold (rose gold tone)
• Dial: black with applied luminous indices
• Bezel: unidirectional, black ceramic with Sedna gold liquidmetal scale
• Crystal: sapphire with anti-reflective coating
• Bracelet: two-tone steel and Sedna gold with diver’s extension clasp
• Movement: automatic co-axial
• Functions: hours, minutes, seconds, date, uni-directional dive bezel

Sedna gold is Omega’s proprietary rose-gold alloy containing palladium, which resists color fade over time better than standard 18k rose gold. The gold elements appear on alternating center links, the bezel rim, and the crown.

Design & Finishing

The two-tone construction demands precise finishing where steel meets gold-tone surfaces. On the bracelet, polished gold center links alternate with brushed steel outer links, and the transition between materials is visible at each link junction. The black dial provides a dark canvas that makes the gold hands and indices appear more luminous, especially under indoor lighting. The helium escape valve at 10 o’clock signals professional dive-tool intent despite the dressier two-tone presentation. For a full-steel alternative in the same case size, the 210.90.42.20.01.003 offers a more understated profile. Both are found within the Seamaster collection, but the two-tone version delivers a distinctly more formal impression.

On the Wrist

The mixed-metal bracelet adds marginal weight compared to full steel, which you notice as a slightly more solid presence across the wrist. The black-and-gold combination reads dressy enough for evening wear yet retains the Planet Ocean’s tool-watch credentials through the ceramic bezel and depth rating. The diver’s extension clasp adds an extra 2mm of bracelet length for over-cuff or wetsuit wear. This replica Seamaster 210204 black black delivers that two-tone Seamaster aesthetic for collectors who find all-steel Planet Oceans too understated for their rotation.