Omega · Aqua Terra

Strap for Seamaster Aqua Terra 150M Co-Axial 38.5 Yellow Gold / Diamond / Black / Bracelet

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

Lug width

20mm

20 mm straps All Omega

Lug width20 mm

Case diameter39 mm

Reference231.55.39.21.51.002 (aka: 23155392151002)

FamilyAqua Terra

MovementOmega caliber 8501 hours, minutes, seconds | date | chronometer, co-Axial escapement

CaseYellow Gold

Recommended spring bar

Spring bars Omega 20mm — 1.8mm diameter

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

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Straps for the Aqua Terra 231.55.39.21.51.002 (aka: 23155392151002)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Aqua Terra 231.55.39.21.51.002 (aka: 23155392151002), seen from the bench

The Aqua Terra represents Omega's sporty-elegant collection, characterized by the automatic caliber 8501 movement with co-axial escapement and chronometer certification. The caliber offers indication of hours, minutes, central seconds and date. The reference 231.55.39.21.51.002 features a construction that combines technical elements of the Omega watchmaking tradition with modern anti-magnetic solutions.

Frequently asked questions

What lug width does the Omega Aqua Terra 231.55.39.21.51.002 have?

The Omega Aqua Terra 231.55.39.21.51.002 features a <a href="/pages/termine-glossario/misura-ansa">lug width</a> of exactly 20mm. This dimension is integrated into the structure of the yellow gold case and requires straps built with precise millimetric tolerances. It is not compatible with 18mm or 22mm lugs.

What is the recommended strap for this yellow gold Aqua Terra?

For the Aqua Terra 231.55.39.21.51.002 in yellow gold, <a href="/pages/termine-glossario/alligatore">alligator</a> represents the ideal choice: it offers regular grain and natural patina that enhance the golden case without competing visually. Vegetable-tanned <a href="/pages/termine-glossario/concia-vegetale">calf leather</a> and <a href="/pages/termine-glossario/shell-cordovan">shell cordovan</a> are also excellent for those desiring chromatic evolution over time.

How do you change the strap on the Omega Aqua Terra 231.55.39.21.51.002?

Strap replacement requires extraction of the transverse pins using a dedicated tool (spring bar tool). Insert the blade into the pin slot, compress the internal spring slightly, and slide the pin out of the case lug. The new 20mm strap is inserted in reverse. If you fear damage, entrust it to an expert.

Can I use a compatible aftermarket strap instead of the original Omega bracelet?

Yes. A quality aftermarket strap in 20mm <a href="/pages/termine-glossario/misura-ansa">lug width</a> is completely compatible. Ensure the strap is specifically built for 20mm lugs to guarantee precise insertion without play or forcing.

How long does a leather strap last on a watch worn daily?

A quality handcrafted leather strap, subject to daily wear, maintains structural integrity for 3-5 years before requiring replacement. Factors such as humid climate, sun exposure, and frequency of use influence durability. The patina that develops increases aesthetic character over time, until visible friction emerges.

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