Omega · Aqua Terra

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

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
Reference231.23.30.20.55.001 (aka: 23123302055001)
FamilyAqua Terra
MovementOmega caliber 8520 hours, minutes, seconds | date | chronometer, co-Axial escapement
CaseMother of Pearl | Red 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 231.23.30.20.55.001 (aka: 23123302055001)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Aqua Terra 231.23.30.20.55.001 (aka: 23123302055001), seen from the bench

The Aqua Terra is part of Omega's Seamaster collection and is equipped with the automatic caliber 8520 with co-axial escapement. The movement offers hour, minute, second and date functions, with chronometer certification. The reference 231.23.30.20.55.001 features a mixed materials construction.

Frequently asked questions

What is the lug width of the Omega Aqua Terra 231.23.30.20.55.001?

The lug width is 20 mm. This dimension is specific to this model and is not compatible with 18 mm or 22 mm straps. Measure the internal distance between the lugs at 12 and 6 o'clock to verify the compatibility of any aftermarket straps.

Which strap is recommended for the Omega Aqua Terra 231.23.30.20.55.001?

For this model, straps in alligator leather with vegetable tanning (developing patina over time), box calf for daily durability, shell cordovan for an elegant burgundy tone, or rubber treated with texture for warm seasons are ideal. The choice depends on use: daily sports wear, formal occasions, or humid environments.

How do I change the strap on my Omega Aqua Terra 231.23.30.20.55.001?

The change requires a spring bar tool. Insert the tip into the lug slot, press downward to compress the internal spring, and extract the pin. Repeat on the other side. Insert the new strap by aligning the holes with the pin and press until you hear the spring click. If you are unsure, contact an authorized Omega service center.

Is a 20 mm aftermarket strap really compatible with this Omega?

Yes, provided the lug width is certified at 20 mm. Verify with the manufacturer that the strap is compatible specifically with Omega and that the lugs have the correct thickness (typically 1.2-1.5 mm for Omega). Low-quality straps can damage the lugs.

How long does natural leather strap last on a sports watch like this Aqua Terra?

An alligator or vegetable-tanned calf strap lasts 2-4 years with daily use, developing a fascinating patina. Durability depends on ambient humidity (tropical climates reduce lifespan), cleaning frequency (avoid prolonged immersion), and quality of craftsmanship. Milano Straps straps come with an 18-month defect coverage.

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