Omega · Constellation

Strap for Constellation Co-Axial 31 Stainless Steel / Red Gold / Diamond / MOP Supernova

Takes 19 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width19 mm
Case diameter31 mm
Reference123.25.31.20.55.001 (aka: 12325312055001)
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 Speedmaster Seamaster 19mm

Technical match for lug width and diameter · lug 19 mm · Ø 1.8 mm

All Omega spring barsOpen →

Straps for the Constellation 123.25.31.20.55.001 (aka: 12325312055001)

Selected for the 19 mm lug width

All 19 mm straps →

The Constellation 123.25.31.20.55.001 (aka: 12325312055001), seen from the bench

The Constellation represents one of Omega's historic collections in the luxury watch segment. It features the automatic Calibre 8520 with co-axial escapement and chronometer certification, offering hours, minutes, seconds and date indications. The reference 123.25.31.20.55.001 has a 31mm case that combines multiple materials in its construction.

Frequently asked questions

What is the lug width of the Omega Constellation 123.25.31.20.55.001?

The lug width of the Omega Constellation 123.25.31.20.55.001 is 19 millimetres. This measurement identifies the distance between the two attachment pins of the strap on the case and is fundamental to ensure compatibility. Any strap selected must have exactly this measurement to ensure a correct fit and secure wearability.

Which strap is recommended for the Omega Constellation 123.25.31.20.55.001?

For the Constellation 123.25.31.20.55.001, the most appropriate straps are in alligator for a formal and sophisticated aesthetic, vegetable-tanned calf for those who appreciate the natural ageing of leather, or shell cordovan for purists seeking maximum durability and nobility. The choice depends on the context of use and personal preferences for aesthetics and patina.

How do you change the strap on the Omega Constellation 123.25.31.20.55.001?

The strap is changed by actuating the spring bars using a specific tool, the spring bar tool. Insert the tip of the tool into the lateral hole of the pin, apply light pressure to retract the internal spring, and extract the old strap. Repeat the operation with the new strap, ensuring that the pin is fully inserted into the case seats. To avoid damage, it is advisable to consult a professional.

Are there aftermarket straps compatible with the Constellation 123.25.31.20.55.001?

Yes, there are numerous aftermarket straps on the market compatible with 19mm lug width. Milano Straps offers a collection of customisable artisanal leather straps in leather, colour and stitching, maintaining technical compatibility and elevating constructive quality compared to many standard solutions.

How long does a leather strap last on the Omega Constellation 123.25.31.20.55.001?

The durability of a leather strap depends on the material chosen and daily use. A high-quality artisanal alligator or calf strap, with appropriate care, lasts an average of 3-5 years; shell cordovan can exceed 10 years. Milano Straps guarantees its straps for 18 months from receipt and recommends replacement when signs of structural failure or excessive leather deterioration occur.

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