Omega · Constellation
Strap for Constellation Co-Axial 31 Red Gold / Brown
Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
Recommended spring bar
Straps for the Constellation 123.50.31.20.13.001 (aka: 12350312013001)
Selected for the 20 mm lug width · workshop selection
Black Alligator Strap with Light Blue Edges€149
Red Alligator Strap Water Resistant€195
Green Rubberized Alligator Strap with Ecru Tribal Stitching€149
Hammered Calfskin Strap Light Blue€98
Vintage Olive Green Calf Leather Watch Strap€80
The Constellation 123.50.31.20.13.001 (aka: 12350312013001), seen from the bench
Frequently asked questions
What is the lug width of the Omega Constellation 123.50.31.20.13.001?
The lug width is 20mm, which is the distance between the integrated case lugs of 20 millimetres. This is a structural constant of this women's model and requires specific 20mm straps for perfect compatibility.
What is the best material for a strap on this Constellation?
Genuine alligator in dark tones (brown, black, burgundy) remains the most elegant choice: the natural texture and regular grain dialogue with rose gold without competing. Vegetable-tanned calf is an excellent modern alternative, offering natural patina and breathability. Avoid materials with coarse grain or straps with excessive stitching.
How do you change the strap on a watch with integrated lugs?
The Constellation's integrated lugs require millimetre-precise craftsmanship. Unlike traditional lugs, you cannot use a generic tool. We recommend entrusting the work to an expert: at Casati Milano or at specialized jewelleries that understand Omega's integrated architecture.
Are aftermarket straps compatible with the Constellation 123.50.31.20.13.001?
Yes, all 20mm straps are physically compatible, but the critical element is the sartorial craftsmanship of the attachment. Omega's integrated lugs are specific architectures that require precise shaping. Milanostraps offers 20mm straps customised and tailored at the Casati Milano atelier.
How long does a leather strap last on this watch?
A quality alligator or calf strap, worn daily, maintains optimal performance for 3–5 years. Durability depends on intensity of use, humidity and care. Casati Milano straps benefit from an 18-month warranty and can be refurbished or replaced thanks to modular construction.
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