Omega · Constellation

Strap for Constellation Co-Axial 27 Brushed Stainless Steel / Red Gold / Diamond / Tahiti 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
Reference123.25.27.20.57.006 (aka: 12325272057006)
FamilyConstellation
MovementOmega caliber 8520 Hours, Minutes, Seconds | Date | Chronometer, Co-Axial Escapement
CaseMother of Pearl | Red 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

All Omega spring barsOpen →

The Constellation 123.25.27.20.57.006 (aka: 12325272057006), seen from the bench

The Omega Constellation 123.25.27.20.57.006 is a 27 mm women's luxury watch featuring a two-tone 18K red gold and stainless steel case with Tahitian mother-of-pearl dial. The Omega 8520 automatic movement offers Co-Axial escapement and Chronometer certification. The iconic lateral griffes and sapphire caseback displaying the movement define the Constellation heritage. Lug width is 18 mm.

Frequently asked questions

What is the lug width of the Omega Constellation 123.25.27.20.57.006?

The lug width of this model is 18 millimetres. This dimension is the perpendicular space between the two strap attachments on the case, measured between the iconic lateral griffes of the Constellation. It is essential to verify this measurement before purchasing a compatible strap.

What strap material is recommended for the 27mm Constellation two-tone?

Alligator is the noblest choice for this timepiece: the regular grain and natural lustre perfectly complement the rose gold and steel two-tone case without competing with the mother-of-pearl dial. Vegetable-tanned calf is a versatile and sustainable alternative. For more formal occasions, shell cordovan offers unparalleled character.

How do you correctly change the strap on an Omega Constellation?

The Omega Constellation 123.25.27.20.57.006 uses standard straight lugs of 18mm on the lateral griffes. Gently extract the spring bar with an appropriate tool by applying pressure from the inside outward, replace the old strap with a new one of the same width, and reinsert the spring bar until it locks into place. It is advisable to perform this operation on a soft surface to avoid scratching the case.

Is an 18mm aftermarket strap compatible with this Omega?

Yes, any strap with an 18 millimetre lug width is compatible with the Constellation 123.25.27.20.57.006, provided the spring bars are standard. However, we recommend choosing artisanal quality straps (alligator, vegetable-tanned calf, shell cordovan) to maintain the aesthetic proportion and value of the watch over time.

How long does a leather strap last on a daily-worn watch?

The lifespan of an artisanal fine leather strap (alligator, calf, shell cordovan) ranges from 3 to 7 years depending on daily use and care. Frequent exposure to moisture, perspiration and sunlight accelerates wear. A vegetable-tanned strap develops a natural patina that enhances its appearance over time. Milano Straps offers an 18-month warranty on all custom straps, with maintenance and regeneration options available.

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