Omega · De Ville

Strap for De Ville Prestige Co-Axial 36.5 Red Gold / Silver/ Bracelet

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

Lug width20 mm
Case diameter37 mm
Reference4178.31.00 (aka: 41783100)
FamilyDe Ville
MovementOmega caliber 2500 Hours, Minutes, Seconds | Date | Co-Axial Escapement, Chronometer
CaseRed Gold

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 4178.31.00 (aka: 41783100)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The De Ville 4178.31.00 (aka: 41783100), seen from the bench

The Omega De Ville Prestige Co-Axial 4178.31.00 is a 36.50mm dress watch in 18k red gold with a 20mm lug width. It features an integrated date window, applied indices, and smooth bezel. The Co-Axial Escapement movement (caliber 2500) delivers certified chronometric precision with reduced internal friction. The transparent caseback reveals the movement's refined finishing: finely-grained wheels, Genève-regulated balance spring, and Geneva striping on plates. This model embodies restrained elegance without unnecessary complications—hours, minutes, seconds, and date only.

Frequently asked questions

What is the lug width of the Omega De Ville 4178.31.00?

The lug width is exactly 20mm. This is the distance between the two inner lugs where the strap is inserted. Compatible straps must have this precise measurement; 18mm or 22mm straps will not fit correctly.

Which strap is recommended for this Omega model?

Alligator is the most natural choice: its fine texture dialogues harmoniously with the rose gold case. Vegetable-tanned calf offers a more conscious tactile experience, while shell cordovan creates warm monochomatism. Rubber is not recommended: a rose gold case deserves a different material statement.

How do you change the strap on an Omega watch?

With two tools: a spring bar tool to extract the elastic pins from the lugs. Insert the flat tip under the pin, press toward the center of the watch, and the pin retracts releasing the strap. Reverse the procedure to mount the new strap. If you lack experience, a professional watchmaker completes the operation in 10 minutes.

Can I use an aftermarket strap with my Omega De Ville 4178.31.00?

Absolutely yes. A 20mm aftermarket strap, made from quality leather (alligator, calf, shell cordovan) fits perfectly onto the original lugs of the watch. In fact, many collectors choose artisanal straps to personalize their watch and create custom color combinations.

How long does a leather strap last before degrading?

A quality leather strap, with vegetable tanning or alligator, lasts 3-5 years with average daily wear, up to 7-10 years with occasional wear and conscious maintenance. Durability depends on exposure to sweat, water, and regular cleaning. The natural patina that develops is not degradation but acquired character; replacement occurs when the leather loses elasticity or stitching loosens.

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