Omega · Constellation

Strap for Constellation Co-Axial 38 Stainless Steel / Red Gold / Silver

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

Lug width20 mm
Case diameter38 mm
Reference123.20.38.21.52.001 (aka: 12320382152001)
FamilyConstellation
MovementOmega caliber 8500 Hours, Minutes, Seconds | Date | Chronometer, Co-Axial Escapement
CaseRed 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

All Omega spring barsOpen →

Straps for the Constellation 123.20.38.21.52.001 (aka: 12320382152001)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Constellation 123.20.38.21.52.001 (aka: 12320382152001), seen from the bench

The Constellation features the Omega caliber 8500 automatic with co-axial escapement and chronometer certification. The movement offers central hours, minutes, seconds and date indication. The reference 123.20.38.21.52.001 is part of the brand's contemporary collection.

Frequently asked questions

What is the lug width of the Omega Constellation 123.20.38.21.52.001?

The lug width of the Constellation 123.20.38.21.52.001 is 20mm. This measurement represents the distance between the two case lugs where the strap is inserted. To verify it, use a digital caliper by measuring internally at the lugs, or consult the official Omega specifications directly.

Which strap material pairs best with the Constellation 123.20.38.21.52.001 in steel and rose gold?

For this bimetallic case, we recommend dark brown alligator, cognac shell cordovan, or black calf. Dark brown alligator enhances the warmth of rose gold; shell cordovan evolves over time creating personal uniqueness; black calf amplifies the steel-gold contrast with sober elegance. The choice depends on your primary use context.

How do you change the strap on the Constellation 123.20.38.21.52.001?

Strap replacement requires specific tools: a spring bar tool to remove the metal bars that secure the strap to the case lugs. Position the tool tip in the small holes of the lug to compress the spring and release the bar. If you are not experienced, entrust the task to a professional to avoid damaging the case.

Is an aftermarket strap compatible with the Omega Constellation 123.20.38.21.52.001?

Any strap with a lug width of 20mm is compatible with the Constellation 123.20.38.21.52.001. Milano Straps artisanal straps are manufactured in this specific size and guarantee perfect fit. Always verify the lug width before purchase to avoid discrepancies.

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

The lifespan of a leather strap varies based on material and usage: mid-quality calf lasts 18-24 months; shell cordovan and alligator reach 3-5 years thanks to superior natural density; vegetable-tanned leather offers 2-3 years with evolving patina. Frequent exposure to water, humidity, and perspiration reduces longevity. Milano Straps straps include an 18-month warranty with the possibility of early replacement if necessary.

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