Omega · Constellation
Strap for Constellation Co-Axial 31 Red Gold / Snow / Diamond Supernova
Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.
Lug width
Straps for the Constellation 123.55.31.20.55.008 (aka: 12355312055008)
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 123.55.31.20.55.008 (aka: 12355312055008), seen from the bench
Frequently asked questions
What is the lug width of the Omega Constellation 123.55.31.20.55.008?
The lug width of the Constellation 123.55.31.20.55.008 is 20mm. This measurement is taken as the linear distance between the outer edges of the lug attachments (lugs) on the case. It is important not to confuse this measurement with the overall case width: the strap must fit perfectly to the attachments, and 20mm is the precise measurement for this model.
Which strap material pairs best with the Constellation 123.55.31.20.55.008 in red gold?
Alligator is the most elegant choice for this model: its natural and uniform grain amplifies the luxury of 18kt red gold. Alligator in cognac or dark brown tones creates perfect chromatic harmony. Shell cordovan is a contemporary alternative that develops over time a deep and fascinating patina, creating an aesthetic narrative parallel to the aging of gold.
How do you change the strap on the Constellation 123.55.31.20.55.008?
The strap is changed through the lateral lug attachments on the case. Use a spring bar tool (specific tool) to compress the attachment pin inside the lug, applying gentle leverage. Once the pin is released from one side, remove the old strap. Insert the new strap by aligning it to the lugs and snap the pin into the opposite hole. If you prefer to avoid doing it yourself, consulting an expert is always recommended.
Can I use an aftermarket strap with my Omega Constellation 123.55.31.20.55.008?
Absolutely yes. Omega, unlike other brands, allows the use of quality aftermarket straps. It is essential that the strap has a certified 20mm lug width. Milano Straps offers a dedicated collection of 20mm compatible straps, crafted to the same excellence standards, with customization options and 18-month warranty.
How long does a leather strap last on a watch like the Constellation?
The durability of a leather strap depends on material, frequency of use, and care. A quality artisanal alligator or shell cordovan strap, worn daily, typically lasts 3-5 years before requiring replacement due to natural wear. Factors such as humidity, sun exposure, and perspiration accelerate aging. Proper maintenance (drying after water contact, avoiding prolonged soaking) significantly extends the strap's useful life.
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

