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 width20 mm
Case diameter25 mm
Reference2581.31.00
FamilySeamaster 120M
MovementOmega caliber 1424 hours, minutes, seconds | date | chronometer
Year1993
CaseStainless Steel

Recommended spring bar

Spring bars Omega 20mm — 1.8mm diameter

Technical match for lug width and diameter · lug 20 mm · Ø 1.8 mm

All Omega spring barsOpen →

Straps for the Seamaster 120M 2581.31.00

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Seamaster 120M 2581.31.00, seen from the bench

The Seamaster 120M reference 2581.31.00 is equipped with the Omega 1424 caliber with chronometer certification. The movement indicates hours, minutes, seconds and date. The 120M designation indicates water resistance up to 120 meters of depth.

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