Omega · Aqua Terra

Strap for Seamaster Aqua Terra 150M Co-Axial 38.5 Stainless Steel / Yellow Gold / Grey / 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

Reference231.20.39.21.06.004 (aka: 23120392106004)

FamilyAqua Terra

MovementOmega caliber 8500 hours, minutes, seconds | date | chronometer, co-Axial escapement

Year2016

CaseYellow 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

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All Omega spring barsOpen →

Straps for the Aqua Terra 231.20.39.21.06.004 (aka: 23120392106004)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Aqua Terra 231.20.39.21.06.004 (aka: 23120392106004), seen from the bench

The Omega Seamaster Aqua Terra 150M reference 231.20.39.21.06.004 evolves the sport-elegant collection launched in 2002. This stainless steel and yellow gold two-tone model houses the Omega caliber 8500 Co-Axial movement with innovative escapement that reduces friction and extends maintenance intervals. The 38.50 mm case diameter pairs with a 20 mm lug width, while the transparent caseback displays the certified chronometer movement. The dial features sunburst finish with yellow gold applied hands, and the sapphire crystal offers anti-reflective coating on both sides.

Frequently asked questions

What is the exact lug width of the Omega Aqua Terra 231.20.39.21.06.004?

The lug width is 20mm. This dimension is the standard for the Aqua Terra model with a 38.50mm case. Verify the measurement by positioning a digital caliper between the two internal lugs in a horizontal position.

Which leather strap is best suited for the bicolour Omega Aqua Terra?

Alligator with vegetable tanning is the most elegant choice for this model: the natural texture dialogues with the textured dial. Alternatively, Hermès calf or vegetable-tanned calf offers a minimalist and sophisticated appearance, while a smoky grey NATO strap guarantees sporty practicality.

How do you change the strap on this watch?

The Aqua Terra uses straight 20mm lugs. Remove the lug pins (usually with a spring-loaded extraction tool). Extract the bracelet, align the new strap to the lugs and reinsert the pins. An operation that takes 2-3 minutes and requires no special tools.

Is a 20mm aftermarket strap compatible with the 231.20.39.21.06.004?

Yes, any strap with 20mm lugs installs without forcing on this watch. Verify that the internal passage is perfectly straight and free from deformations. I recommend avoiding straps with overly heavy lugs that could alter the aesthetics of the case.

How long does a leather strap last on a watch like this?

High-quality alligator lasts 6-8 years with regular use. Vegetable-tanned calf tends to last 4-6 years. Longevity depends on ambient humidity, frequency of use and maintenance: monthly application of specific balm extends life by up to 30%.

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