Omega · Constellation
Strap for Constellation Co-Axial 38 Stainless Steel / Yellow Gold / Diamond / Champagne
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 123.25.38.21.58.002 (aka: 12325382158002)
Selected for the 20 mm lug width · workshop selection
Black Alligator Strap with Light Blue Edges€210
Black Alligator Strap with White Edges€210
Millenium Cognac Alligator Strap€270
Matte Blue Alligator Strap€270
Green Rubberized Alligator Strap with Ecru Tribal Stitching€185
The Constellation 123.25.38.21.58.002 (aka: 12325382158002), seen from the bench
Frequently asked questions
What is the lug width of the Omega Constellation 123.25.38.21.58.002?
The lug width of the Constellation 123.25.38.21.58.002 is 20mm. This measurement corresponds to the space between the two lugs of the case and determines the width of the compatible strap. To measure correctly, insert a flexible ruler perpendicularly between the lugs: precise measurement is essential to avoid incompatible purchases.
What is the best strap for the Constellation 123.25.38.21.58.002?
The most suitable strap depends on the intended use. For formal occasions, we recommend black or dark brown alligator with vegetable tanning: the natural texture amplifies the luxury of the two-tone gold-steel case. For everyday wear, a quality calf leather with developing patina offers accessible elegance. Shell cordovan in honey creates an extraordinary color combination with yellow gold, preserving sophistication.
How do you change the strap on the Omega Constellation 123.25.38.21.58.002?
The change is made using a specific tool (spring bar removal tool) to extract the tiny articulation pins from the lugs. Position the tool in the lateral spaces of the lugs, apply light pressure and the pin should slide out. Replace the old strap with the new one by aligning the holes and reinsert the pin. If you don't have the tool, a watchmaker will do it in a few minutes. Avoid forcing to prevent scratching the case.
Which aftermarket straps are compatible with the 123.25.38.21.58.002?
Any strap with a 20mm lug width is physically compatible. Milano Straps offers a wide range of premium materials: alligator, Italian calf, shell cordovan, solid leather, Tropic rubber and NATO fabrics. All 20mm straps are customizable in length, color, initials and stitch types, ensuring perfect fit to your wrist and personal preferences.
What is the lifespan of a leather strap for this watch?
A finely vegetable-tanned leather strap typically lasts 3-5 years with daily use, depending on frequency of use and climatic conditions. Italian calf can develop a beautiful aged patina. Shell cordovan excels in durability, often exceeding 7-10 years. The quality of vegetable tanning is fundamental: poorly cut or industrially tanned leathers deteriorate more rapidly. Milano Straps guarantees 18 months on custom Casati Milano straps, covering any manufacturing defects.
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

