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Omega · Constellation

Strap for Constellation Co-Axial 27 Brushed Yellow Gold / Champagne MOP

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

Lug width

20mm
20 mm strapsAll Omega
Lug width20 mm
Case diameter27 mm
Reference123.50.27.20.57.002 (aka: 12350272057002)
FamilyConstellation
MovementOmega caliber 8521 Hours, Minutes, Seconds | Date | Chronometer, Co-Axial Escapement
CaseYellow 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

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Straps for the Constellation 123.50.27.20.57.002 (aka: 12350272057002)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Constellation 123.50.27.20.57.002 (aka: 12350272057002), seen from the bench

The Omega Constellation reference 123.50.27.20.57.002 (also known as 12350272057002) is equipped with the self-winding caliber 8521 with co-axial escapement and chronometer certification. The movement provides indication of hours, minutes, seconds and date. The case features construction in unspecified materials with standard lugs.

Frequently asked questions

What lug width does the Omega Constellation 123.50.27.20.57.002 have?

The Omega Constellation 123.50.27.20.57.002 features a lug width of 20mm. This is the internal measurement between the lugs where the strap attaches to the case. It is essential to measure correctly with a digital caliper before ordering a strap: an incorrect measurement would result in lateral gaps or mounting difficulties.

Which leather strap is best suited for the Constellation 123.50.27.20.57.002?

For a watch of this balanced elegance, we recommend alligator dyed in neutral tones (black, dark brown, grey) that enhances the applied indices through contrast, or shell cordovan in cognac brown that develops a captivating patina over time. Vegetable-tanned calf represents a more informal and casual alternative to alligator. A yellow gold deployant clasp completes the aesthetic naturally.

How do you change the strap on the Constellation 123.50.27.20.57.002?

Unlike watches with integrated straps, the Constellation allows complete freedom of customization. Using a spring bar tool, gently push the pin holding the strap inward: the pin will retract, allowing you to remove the old strap. Insert the new strap into the lugs, reposition the pin and verify that it is fully locked on both sides.

Which aftermarket straps are compatible with the Constellation 123.50.27.20.57.002?

Any strap designed for 20mm lug width is compatible with this model. Milano Straps offers a complete collection of artisanal straps in this size, customizable in leather (alligator, calf, shell cordovan), color, initials and stitching thread. The Casati Milano atelier also creates custom straps with an 18-month warranty.

How long does a leather strap last on a watch like the Constellation 123.50.27.20.57.002?

The lifespan of a leather strap depends on the leather used and daily wear. High-quality artisanal alligator and shell cordovan last 3-5 years with regular use. Vegetable-tanned calf tends to wear more quickly (2-3 years). To extend the life of the strap, avoid prolonged exposure to water and excessive humidity. Milano Straps provides an 18-month warranty and offers replacement services with pins.

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