Omega · Aqua Terra

Strap for Omega Aqua Terra 231.58.39.21.51.001

The Seamaster Aqua Terra 150M Co-Axial 38.5 Red Gold / Diamond / Black takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

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Lug width18 mm
Case diameter39 mm
Reference231.58.39.21.51.001 (aka: 23158392151001)
FamilyAqua Terra
MovementOmega caliber 8501 Hours, Minutes, Seconds | Date | Chronometer, Co-Axial escapement
CaseRed Gold

Recommended spring bar

Spring bars Omega 18mm — single diameter

Technical match for lug width and diameter · lug 18 mm · Ø 1.8 mm

All Omega spring barsOpen →

Straps for the Aqua Terra 231.58.39.21.51.001

Selected for the 18 mm lug width

All 18 mm straps →

What I'm asked about the Omega Aqua Terra 231.58.39.21.51.001

What strap size does the Omega Aqua Terra 231.58.39.21.51.001 take?

The Omega Aqua Terra 231.58.39.21.51.001 needs 18 mm between the lugs, usually 16 mm at the buckle. It's the size I've been fitting on it for years.

Can the strap on the Omega Aqua Terra 231.58.39.21.51.001 be changed?

Yes. It has spring bars between the lugs: with the right tool the strap comes off in a minute. If you'd rather not risk a scratch, I do it in the workshop.

Can I put a leather strap on the Omega Aqua Terra 231.58.39.21.51.001?

Yes, in 18 mm leather. On a 39 mm case a calf strap works every day; if you want something more, alligator.

Which strap do you recommend for the Omega Aqua Terra 231.58.39.21.51.001?

A 18 mm calf strap, for every day. You'll find it ready in the 18 mm collection. If you'd rather have something built on your wrist, the Casati atelier.

The Aqua Terra 231.58.39.21.51.001, 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 8501 with Co-Axial escapement and chronometer certification, featuring hours, minutes, seconds and date functions. The case size is 39mm according to the reference 231.58.39.21.51.001.

Frequently asked questions

What is the best strap for the Omega Aqua Terra in rose gold?

For the 231.58.39.21.51.001, alligator remains the most coherent choice: the regular grain and pronounced scales enhance the nautical-elegant character of the watch. Dark brown or black alligator creates elegant contrast with rose gold. Shell cordovan represents an excellent alternative for those who appreciate leathers that evolve over time, developing natural patina and darkening. Vegetable-tanned calf is more versatile and modern, ideal for those seeking flexibility in use.

Can I use an aftermarket strap on this Omega?

Yes, the 231.58.39.21.51.001 is fully compatible with quality aftermarket straps, provided they respect the 18mm lug width. Avoid generic or poor-quality straps: since the case is in 18kt rose gold (a noble material), the strap must meet the same construction and aesthetic standards. Customizable artisanal straps with vegetable tanning or rare leathers guarantee durability and a patina that elegantly evolves over time.

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

The lifespan of a leather strap depends on frequency of use, moisture exposure, and tanning quality. A quality artisanal alligator or cordovan strap, with vegetable-tanned leather and hand stitching, lasts an average of 3-5 years with daily use, potentially extending to 5-7 years with proper maintenance (regular drying, avoiding prolonged contact with salt water). A shell cordovan strap tends to last longer thanks to the natural density of horse leather. The 18-month warranty on custom straps (such as those created by Casati Milano) covers construction defects and irregular stitching.

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.

Request an appointment →

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

The atelier's website: casatimilano.com