Omega · Constellation
Strap for Constellation Co-Axial 31 Stainless Steel / Yellow Gold / Diamond / MOP Supernova
Takes 18 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
Recommended spring bar
The Constellation 123.25.31.20.55.002 (aka: 12325312055002), seen from the bench
Frequently asked questions
What is the lug width of the Omega Constellation 123.25.31.20.55.002?
The lug width of this reference is exactly 18mm. It is essential to measure it with a caliper between the inside of the two vertical pins to guarantee absolute strap compatibility.
Which strap is recommended for the Omega Constellation 123.25.31.20.55.002 with mother-of-pearl dial?
To enhance the luminescence of the mother-of-pearl, we recommend alligator leather with vegetable tanning in cognac or polished black tone, or burgundy-colored shell cordovan. A powder grey calf leather offers a lighter alternative for warm seasons.
How do you replace the strap on a 31mm Omega Constellation?
Use a pointed tool (spring bar tool) to compress the small lateral springs (spring bar) under the lug, then slide the old strap out from the pin. Insert the new strap by aligning the holes with the pin and release the spring. Avoid direct hammer blows on the case.
What is the difference between an aftermarket strap and the original Omega Constellation bracelet?
The original Omega bracelet with integrated conical links is a metallurgical masterpiece specific to this reference. An aftermarket strap in leather or rubber offers aesthetic versatility and practicality, maintaining the same lug compatibility (18mm) but creating a completely different visual identity.
How long does a leather strap last on an Omega Constellation worn daily?
A high-quality alligator or shell cordovan strap lasts 3-5 years with daily wear, developing a noble patina. Softer calf leather requires replacement every 2-3 years. Longevity depends on tanning method, exposure to moisture, and periodic maintenance (gentle cleaning, conditioning with specialized creams).
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.
Request an appointment →Casati Milano · Via XX Settembre 15, Milan · by appointment only