Omega · De Ville

Strap for De Ville X2 Co-Axial 35 Big Date Co-Axial Stainless Steel / Black

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

Lug width20 mm
Case diameter35 mm
Reference7813.50.31 (aka: 78135031)
FamilyDe Ville
MovementOmega caliber 2610 hours, minutes, seconds | big 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 De Ville 7813.50.31 (aka: 78135031)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The De Ville 7813.50.31 (aka: 78135031), seen from the bench

The Omega De Ville 7813.50.31 is a minimalist luxury timepiece launched in the 1990s as an evolution of the historic De Ville collection founded in the 1960s. It features a 35mm stainless steel case housing the Omega caliber 2610 Co-Axial movement with hours, minutes, seconds, and big date. The Co-Axial escapement reduces friction and extends service intervals to five years, with COSC chronometer certification guaranteeing ±4/+6 seconds daily accuracy. The 20mm lug width accommodates alternative straps while maintaining the watch's refined proportions and integrated design.

Frequently asked questions

What is the exact lug width of the Omega De Ville 7813.50.31?

The lug width of the De Ville 7813.50.31 is 20mm. This width is measured between the inner shoulders of the integrated lugs and is the fundamental parameter for selecting a compatible strap. Any strap with a 20mm attachment width will fit correctly without play or forcing.

Which strap do you recommend for the Omega De Ville 7813.50.31?

For the De Ville 7813.50.31 we recommend vegetable-tanned alligator, shell cordovan, or aged calf leather. Chocolate brown or taupe-grey alligator emphasizes the vintage character of the coaxial 2610 caliber, while shell cordovan guarantees durability and patina over time. Your choice depends on use: traditional leather for occasions, NATO cotton for versatile daily wear.

How do you change the strap on the Omega De Ville 7813.50.31?

The De Ville 7813.50.31 features integrated lugs that are not interchangeable. To replace the strap, you must remove the spring bars using a specialized tool, without stressing the lugs. We recommend entrusting the operation to an experienced watchmaker or the Casati Milano atelier to avoid damage to the case.

Which aftermarket straps are compatible with the De Ville 7813.50.31?

All straps with a lug width of 20mm are compatible with the De Ville 7813.50.31. On milanostraps.it you will find a curated selection of artisanal straps in alligator, shell cordovan, calf, and textiles, customizable in size, color, and thread stitch, specifically chosen for the proportions of this case.

How long does a leather strap last on an Omega De Ville 7813.50.31?

A quality leather strap, in vegetable tanning or shell cordovan, lasts between 3 and 5 years with moderate daily use. The decisive factors are: humidity, frequency of use, periodic care (cleaning, conditioning). A shell cordovan strap lasts longer thanks to lower porosity. Casati Milano provides an 18-month warranty on all artisanal straps, with spring bar replacement and maintenance service.

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