OMEGA introduced a 30 mm Aqua Terra on 12 June 2025, adding a smaller case size to the collection for the first time. The launch comprises 12 references and two new 20 mm-diameter automatic movements: calibre 8750 for steel and two-tone models, and calibre 8751 for Sedna gold and Moonshine gold versions. The announcement places the watch in a women’s watchmaking context, but the size and styling do not make it exclusive to women.
What changed with the Aqua Terra 30 mm?
OMEGA’s June 2025 launch added a 30 mm case to the Aqua Terra family; it was not an announcement that the wider Seamaster range had become smaller. The brand said this was the first time the collection had been offered in this case size, with 12 new references. OMEGA’s launch announcement, dated 12 June 2025, describes the size as a new addition to the family.
The notable technical change is not simply a smaller case. OMEGA and Swatch Group introduced two movements engineered for this scale, each measuring 20 mm in diameter, and assigned them according to case material.
Which Aqua Terra 30 mm models use calibre 8750 or 8751?
| Calibre | Case assignment | Movement diameter | Thickness |
|---|---|---|---|
| 8750 | Steel and two-tone models | 20 mm | 3.98 mm |
| 8751 | Sedna gold and Moonshine gold models | 20 mm | 4.08 mm |
The movement dimensions and material assignments come from Swatch Group’s release of 18 June 2025. The 8751 is 0.10 mm thicker than the 8750; the group says both were reimagined and engineered specifically for this size.
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What do the two movements share?
According to OMEGA and Swatch Group, both calibres wind automatically in both directions and use a Co-Axial escapement and a free-sprung balance with a silicon balance spring. The manufacturer describes them as Master Chronometer certified, resistant to magnetic fields up to 15,000 gauss, and offering more than 48 hours of power reserve. These are manufacturer-reported specifications, not independent test results.
How do the 12 references differ in materials and design?
The collection spans stainless steel, Sedna gold, Moonshine gold and two-tone combinations. Bracelet options include steel, two-tone steel and gold. Shared details listed by Swatch Group are applied hour markers, a date window at 6 o’clock and a transparent sapphire-crystal caseback.
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The integrated bracelet uses OMEGA’s patented screw-and-pin system and a butterfly clasp. OMEGA specifies a 2 mm easy comfort adjustment; that is a bracelet adjustment feature, not a promise that a particular watch will fit every wrist. Because the bracelet is integrated, do not assume a generic strap will fit without checking compatibility for the exact reference.
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What should you check before choosing one?
- Case and bracelet material: Choose among steel, two-tone, Sedna gold and Moonshine gold, keeping in mind that the material also determines which calibre is fitted.
- Exact reference and dial: The launch covers 12 references. Confirm the reference number and its specific dial, finish and bracelet configuration with OMEGA or an authorized seller.
- Fit: A 30 mm case is a smaller option within the Aqua Terra collection, but case diameter alone does not establish how a watch will sit on an individual wrist. Try the precise configuration where possible.
- Local price and availability: Prices and stock depend on market and reference. OMEGA Japan catalogue results include yen prices for selected models, but they do not establish a single global price or availability elsewhere. Check the current local listing for the exact reference.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
