Omega · Seamaster 120M
Strap for Seamaster 120M Automatic 25 Stainless Steel / Silver
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 Seamaster 120M 2581.31.00
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
Military Alligator Green Strap€138
Hammered Calfskin Strap Light Blue€98
The Seamaster 120M 2581.31.00, seen from the bench
Frequently asked questions
What is the exact lug width of the Omega Seamaster 120M 2581.31.00?
The Omega Seamaster 120M 2581.31.00 features a lug width of 20mm. This measurement is the distance between the two lugs where the strap attaches to the case. It is essential to verify this measurement before ordering a strap to ensure perfect compatibility.
What type of strap is best suited for this Omega model?
For the Seamaster 120M 2581.31.00, we recommend straps in premium alligator or calf leather, which respect the sporty elegance of the model. Alligator offers a natural texture and extraordinary patina over time, while calf guarantees softness and impeccable draping. For water use, a rubber or NATO fabric represents the most resistant and practical option.
How do you change the strap on the Omega Seamaster 120M?
Strap replacement is performed using a specialized tool (spring bar tool) to remove the pins that secure the strap to the case lugs. It is recommended to hold the case firmly, insert the tool into the pin slot and gently lever downward. To avoid scratches, it is preferable to entrust the operation to an expert or request the service at the Casati Milano atelier.
Is the Seamaster 120M 2581.31.00 compatible with quality aftermarket straps?
Yes, it is fully compatible with quality aftermarket straps, provided they are made for the 20mm lug width. Milanostraps offers a curated collection of handcrafted straps in various materials, designed to guarantee the same comfort and precision as the original Omega strap, with greater aesthetic versatility.
How long does a leather strap last on a watch like the Seamaster 120M?
The lifespan of a leather strap depends on the material and usage. A premium alligator or calf strap, with proper care, can last 3-5 years with daily wear. Factors such as humidity, sweat and sun exposure accelerate wear. With preventive maintenance and correct storage, longevity extends considerably. The Casati Milano atelier offers an 18-month warranty on all custom straps.
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

