Omega · Aqua Terra

Strap for Seamaster Aqua Terra 150M Co-Axial 34 Stainless Steel / Diamond / 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 diameter34 mm
Reference231.18.34.20.55.001 (aka: 23118342055001)
FamilyAqua Terra
MovementOmega caliber 8521 hours, minutes, seconds | date | chronometer, co-Axial escapement
CaseStainless 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 231.18.34.20.55.001 (aka: 23118342055001)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Aqua Terra 231.18.34.20.55.001 (aka: 23118342055001), seen from the bench

The Omega Aqua Terra 231.18.34.20.55.001 represents the contemporary evolution of one of Omega's most iconic sports timepieces. This 34mm stainless steel model features the Co-Axial caliber 8521 movement with advanced escapement, ensuring certified chronometry and reduced component wear. The integrated bracelet design, with its 20mm lug width, combines essential functions—hours, minutes, seconds, date—in a compact, elegant profile suited for wrists up to 17.5cm, delivering understated power and instant legibility.

Frequently asked questions

What is the lug width of the Omega Aqua Terra 231.18.34.20.55.001?

The lug width measures 20mm. This width is specific to the model and must be respected with precision when choosing a replacement strap to maintain the correct aesthetic proportions between case and strap.

Which strap materials pair best with the Aqua Terra 231.18.34.20.55.001?

Vegetable-tanned alligator represents the most sophisticated choice, followed by vegetable-tanned calf leather. For a sportier profile, technical NATO and rubber with ribbed sole integrate perfectly with the watch's design, maintaining both elegance and functionality.

How do you correctly measure lug width?

Measure from the base of the spring bar on one end to the base of the opposite end, excluding any lateral case protrusions. For the Aqua Terra 231.18.34.20.55.001, the measurement must be exactly 20mm to ensure proper insertion into the lugs without forcing.

Can I use an aftermarket strap compatible with the Omega Aqua Terra 231.18.34.20.55.001?

Yes, provided the strap is manufactured for a 20mm lug width. Artisanal leather or rubber straps offer complete compatibility while maintaining high quality standards and allowing customization in terms of color, texture, and stitching thread.

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

A natural leather strap with vegetable tanning lasts an average of 3-5 years with regular maintenance, depending on exposure to water and humidity. Superior quality artisanal straps often benefit from 18-month warranties and can be renewed through a leather replacement service on the original lug.

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