Omega · Constellation

Strap for Constellation Co-Axial 27 Brushed Stainless Steel / Yellow Gold / Diamond / Pink MOP

Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width18 mm
Case diameter27 mm
Reference123.25.27.20.57.005 (aka: 12325272057005)
FamilyConstellation
MovementOmega caliber 8520 Hours, Minutes, Seconds | Date | Chronometer, Co-Axial Escapement
CaseMother of Pearl | Yellow Gold, Stainless Steel

Recommended spring bar

Spring bars Omega 18mm — single diameter

Technical match for lug width and diameter · lug 18 mm · Ø 1.8 mm

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The Constellation 123.25.27.20.57.005 (aka: 12325272057005), seen from the bench

The Omega Constellation 123.25.27.20.57.005 is a refined women's timepiece combining a 27mm yellow gold 18K case with white mother-of-pearl dial and diamond indices. Powered by the Omega 8520 automatic co-axial movement, it features a date complication, sapphire crystal, and 100m water resistance. The integrated Manhattan bracelet with iconic griffes is part of the Constellation collection, born in 1952 to celebrate chronometric precision. The 18mm lug width is the standard for this women's Constellation model.

Frequently asked questions

What is the lug width of the Omega Constellation 123.25.27.20.57.005?

The Constellation 123.25.27.20.57.005 features a lug width of 18 millimetres, standard for the feminine models in the collection. This width ensures proportional balance with the 27 mm case diameter and determines compatibility with aftermarket straps.

What is the best strap for the Constellation 123.25.27.20.57.005?

For this feminine model in yellow gold and mother-of-pearl, dark brown or black alligator represents the choice of excellence: its fine grain and uniform texture naturally complement the dignity of the precious metal. Cognac calf offers a softer and warmer alternative on the wrist, ideal for those seeking everyday practicality.

How do I change the strap on the Constellation 123.25.27.20.57.005?

Since the 123.25.27.20.57.005 is fitted with an integrated Manhattan bracelet, strap replacement is not a standard operation. It is advisable to entrust the work to a qualified professional at an Omega service centre or at the Casati Milano atelier, which has the necessary expertise to perform the replacement while preserving the constructive integrity of the watch.

Can I fit an aftermarket strap compatible with the 123.25.27.20.57.005?

Yes, any strap with an 18 millimetre lug width is compatible from a dimensional standpoint. However, replacing the integrated Manhattan bracelet requires specific expertise. Contact Casati Milano to assess technical feasibility and aesthetic compatibility with the original Constellation design.

What is the average lifespan of a leather strap for the Constellation 123.25.27.20.57.005?

A high-quality alligator or calf strap, with regular maintenance, maintains structural and aesthetic integrity for 3-5 years of daily use. Longevity depends on exposure to humidity, direct sunlight and the type of tanning. Straps made by Casati Milano include an 18-month warranty and maintenance advice to extend durability over time.

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