Omega · De Ville

Strap for De Ville Prestige Small Seconds 34.4 Stainless Steel / 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 diameter34 mm
Reference4520.21.00
FamilyDe Ville
MovementOmega caliber 651 hours, minutes, small seconds
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 4520.21.00

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The De Ville 4520.21.00, seen from the bench

The De Ville Prestige Small Seconds model 4520.21.00 is a 34.4mm stainless steel dress watch with a silver dial, featuring Omega's caliber 651 manual movement. The lug width is 20mm. This timepiece exemplifies understated elegance with applied hour markers, slender hands, and small seconds at 6 o'clock, maintaining the austere character of the intermediate generation De Ville line without modern revisions.

Frequently asked questions

What is the lug width of the Omega De Ville 4520.21.00?

The Omega De Ville reference 4520.21.00 has a lug width of 20mm. This measurement is crucial for strap compatibility: the case lugs accommodate exactly 20mm lug width. Measurement errors are common; always verify directly between the internal case lugs with a ruler, taking a photograph of the detail for consultation with your retailer.

Which strap is best suited for the De Ville 4520.21.00 in steel?

For the De Ville 4520.21.00, honeyed alligator (natural cognac tone) is the archetypal choice: the fine grain refracts light delicately, enhancing the soft reflections of the brushed case. For a marked contrast, vegetable-tanned calf in dark brown or tobacco work excellently. Burgundy shell cordovan remains the absolute luxury solution, developing a mirror patina with wear. Avoid glossy finishes: this watch does not declare, it simply is.

How do you change the strap on an Omega De Ville 4520.21.00?

The De Ville 4520.21.00 features fixed lugs (non-removable) with a simple spring bar. To replace the strap: gently extract the lug from its seat with a flat tool (penknife or professional lever), applying leverage from bottom to top. Slide the old strap out from the spring bar, then insert the new one. If you notice irritated or uncertain lugs, entrust the operation to a watchmaker. Casati Milano offers strap changes by appointment in Milan, with consultation on leather selection.

Can I mount a compatible 20mm aftermarket strap on this De Ville?

Yes, any strap with a 20mm lug width is compatible with the De Ville 4520.21.00. Lug width is the only critical parameter; length, material, and color depend on your aesthetic preferences and wrist size. We recommend spring bars in brushed or natural steel to maintain consistency with the case finish. The 20mm straps from Milano Straps are tested for compatibility and available in over 30 material and color variants.

How long does a leather strap last on an Omega De Ville 4520.21.00?

Durability depends on leather quality and wear. A quality alligator or vegetable-tanned calf, worn daily, has an average lifespan of 3-5 years before requiring replacement. Shell cordovan resists for 10+ years or more, developing an accelerated patina. Regular contact with the wrist, perspiration, and sun exposure shorten its life; a NATO canvas is practically eternal. Casati Milano guarantees 18 months on made-to-order straps, with the option of regeneration or leather replacement after natural wear.

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