Strap for Seamaster 120M Automatic 36.25 Yellow Gold / Diamond / Blue

The Omega Seamaster 120M ref. 2105.80.00 has a lug width of 18mm. This technical specification is essential for purchasing a compatible replacement strap. To verify the lug width, position a digital caliper on the inner shoulders of the case lugs and measure the distance: it should return exactly 18mm.

The ideal material depends on the context of use. For formal and dressy occasions, black or dark brown alligator creates an elegant contrast with the yellow gold case. For everyday wear, vegetable-tanned calf offers durability and develops a patina over time. Shell cordovan represents a balance between elegance and durability. In summer, a technical fabric or thin rubber maintains the timepiece's sporty vocation.

Changing the strap is straightforward: use a dedicated spring bar tool. Insert the flat tip of the spring bar tool into the slot beneath the lug to release the pressure, then extract the old spring bar from the ends of the strap. Position the new spring bar in the seats of the new strap and reinsert it into the case lugs until you hear the locking click. A specialized atelier can perform the operation with precision and without risk.

Yes, any strap with an 18mm lug width is compatible with the Seamaster 120M 2105.80.00. Milano Straps offers a complete collection of 18mm handcrafted straps, customizable in leather, color, and stitching. For a bespoke experience, the Casati Milano atelier creates custom straps after personal consultation, with an 18-month warranty.

The lifespan of a leather strap depends on the material and usage. A standard quality calf lasts 18–24 months with daily wear. Shell cordovan, thanks to its superior structural density, can resist 3–4 years or more. A high-quality alligator strap lasts 2–3 years. Exposure to sunlight, humidity, and perspiration accelerates aging. Proper maintenance—periodic cleaning and conditioning—significantly extends the strap's lifespan.