Omega · Aqua Terra

Strap for Seamaster Aqua Terra 150M Co-Axial 30 Stainless Steel / Yellow Gold / MOP / Bracelet

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter30 mm
Reference231.20.30.20.55.004 (aka: 23120302055004)
FamilyAqua Terra
MovementOmega caliber 8520 hours, minutes, seconds | date | chronometer, co-Axial escapement
CaseMother of Pearl | Yellow Gold, Stainless Steel

Recommended spring bar

Spring bars Omega 20mm — 1.8mm diameter

Technical match for lug width and diameter · lug 20 mm · Ø 1.8 mm

All Omega spring barsOpen →

Straps for the Aqua Terra 231.20.30.20.55.004 (aka: 23120302055004)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Aqua Terra 231.20.30.20.55.004 (aka: 23120302055004), seen from the bench

The Aqua Terra belongs to Omega's Seamaster collection and represents a sporty-elegant timepiece. It is powered by the automatic Caliber 8520 with Co-Axial escapement and chronometer certification, offering hour, minute, second and date functions. The model uses high-quality materials in the construction of the case and bracelet.

Frequently asked questions

What is the exact lug width of the Omega Aqua Terra 231.20.30.20.55.004?

The lug width is 20mm. This measurement is specific to the 30mm case size of the Aqua Terra and differs from larger versions in the collection. The measurement should be taken with a digital caliper on the internal part of the case, laterally, to ensure precise compatibility with aftermarket straps.

What strap material is recommended for this two-tone Aqua Terra?

Natural alligator or warm tones (cognac, bordeaux) is the ideal choice to maintain aesthetic balance with the mother-of-pearl and yellow gold. Shell cordovan develops a honey patina over time and offers superior durability. Vegetable-tanned calf leather is perfect for those who value environmental impact, while FKM rubber is recommended for a sporty interpretation.

How do you replace the strap on an Omega Aqua Terra 231.20.30.20.55.004?

The lugs are integrated into the case, making strap replacement a delicate operation. It requires the intervention of a specialized professional: Milano Straps and the Casati Milano atelier offer this service. Do not attempt self-replacement, as the attachments have precise tolerances and risk of damage.

Is an aftermarket strap compatible with the 231.20.30.20.55.004?

Yes, provided it is sized for 20mm lug width and designed with drilling and shaped flanks compatible with Omega's integrated attachments. Milano Straps offers certified 20mm online straps for this model, while Casati Milano creates bespoke custom solutions.

How long does a leather strap last on an Aqua Terra?

A well-maintained alligator or calf leather strap lasts 3-5 years of daily use, developing a natural patina over time. Durability depends on exposure to moisture, heat, and intensity of use. Shell cordovan is more resistant and can last 5-7 years. Milano Straps offers an 18-month warranty on all customized straps.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only