The 231.10.42.21.01.006 reference brings a 42mm steel case to the Seamaster Aqua Terra family, and this replica Seamaster 231104 42mm 1006 reproduces that mid-size format with a black vertical-stripe dial and date window at 3 o’clock. The 231 generation preceded the current 220 references, carrying slightly thicker lugs and a different caseback design that reflects Omega’s earlier co-axial era. At 42mm it sits one millimeter above the 41mm Aqua Terra, but the visual difference comes from the lug shape rather than the case diameter alone.

Build Details

• Case diameter: 42mm
• Case material: stainless steel
• Dial: black with vertical stripe pattern
• Crystal: sapphire with anti-reflective coating
• Bracelet: stainless steel with deployant clasp
• Movement: automatic co-axial
• Functions: hours, minutes, seconds, date at 3 o’clock

The vertical stripes on the 231 dial run perpendicular to the teak-deck pattern found on the newer 220 series, giving it a visual identity distinct from its successor. The date window at 3 instead of 6 also separates the two generations at a glance.

What Collectors Notice

The 231-series Aqua Terra occupies a specific spot in Seamaster history. It introduced the co-axial escapement to the Aqua Terra sub-line and moved the Seamaster family toward a more refined aesthetic. The 42mm case uses a screw-in caseback with the Seamaster hippocampus medallion, a design detail that the newer 220 series replaced with an exhibition caseback. Compared to the 231.10.42.22.02.001, which adds a calendar complication, this reference keeps the dial simpler with only a date function. Both belong to the Seamaster range, representing the 231 generation at different complexity levels.

This vs Other Versions

The 231-series competes with the newer 220 on finishing and dial texture, but collectors often prefer the older generation for its slightly heavier case weight and the vintage-adjacent lug profile. The black vertical-stripe dial photographs darker than the teak-deck pattern, giving it a more formal look in most lighting conditions. For a watch that reads as business-appropriate without dipping into dress-watch territory, this replica Seamaster 231104 42mm 1006 holds that middle ground confidently.