Marked as a 150m water-resistance reference, the 231.10.42.22.02.001 adds a calendar complication to the 42mm Seamaster Aqua Terra platform, and this replica Seamaster 231104 42mm 2001 captures that added functionality. The silver-white dial displays day, date, and month through separate apertures, making this one of the more informationally dense Aqua Terra variants in the 231 generation. At 42mm in stainless steel, the case proportions remain consistent with other 231-series references, but the additional sub-dials shift the visual balance toward a dressier, more complex watch.

Technical Overview

• Case diameter: 42mm
• Case material: stainless steel
• Dial: silver-white with calendar displays
• Crystal: sapphire with anti-reflective coating
• Bracelet: stainless steel with butterfly deployant clasp
• Water resistance: 150m
• Movement: automatic co-axial with calendar
• Functions: hours, minutes, seconds, day, date, month

The calendar layout places the month at 12, day at 9, and date at 3, distributing information symmetrically across the dial. Omega used a central seconds hand rather than a small seconds sub-dial, keeping the design cleaner than a full chronograph layout.

Inside the Movement

The calendar complication requires additional gearing beyond a simple date mechanism. Each display advances at midnight, and the day and month apertures change simultaneously with a single corrector push. The co-axial escapement in the genuine caliber reduces friction at the pallet fork, which this version replicates through its automatic movement. For a non-calendar take on the same 231-series case, compare the Tiffany Dial 220.10.41.21.03.006 from the newer 220 generation. Both sit in the Seamaster collection, but the calendar version delivers substantially more wrist-level information.

What Sets It Apart

Calendar Aqua Terras are less common than time-only versions, which makes this reference stand out in any collection. The silver-white dial brightens the overall presentation compared to the black and grey options in the same generation. It reads formal enough for suit-and-tie settings but maintains the Seamaster’s inherent sporting DNA through its 150m water resistance rating. This replica Seamaster 231104 42mm 2001 gives you complication depth that most three-hand Aqua Terras simply do not offer.