Strap for Seamaster 120M Quartz 36.25 Stainless Steel / Silver / Bracelet

The lug width of the 2511.31.00 is 18 mm, a classic dimension that requires specifically designed straps. This width is measured internally between the two lugs of the case, at the contact point with the strap. It is not compatible with standard 20 mm or 22 mm straps without structural modifications.

Cognac brown alligator represents the most balanced choice: it maintains elegant proportions thanks to reduced thickness and minimal grain, enhancing the 36.25 mm case without visual overload. For formal settings, black calf leather with vegetable tanning. For marine contexts, vulcanized rubber with integrated deployant offers practicality without functional compromises.

Insert a spring bar tool into the lower groove of the lug, gently compressing the spring. Once compressed, extract the lug from the lug slot. Repeat the procedure on the other side. Insert the new lug into the slots and verify that it sits perfectly before closing. The operation requires slow and deliberate movement to avoid scratches.

Yes, all straps with 18 mm lug width are physically compatible. However, aesthetic compatibility requires attention: the strap thickness must not exceed 4-4.5 mm to maintain the original proportions of the Seamaster. Always verify that the lug slot adheres naturally to the case without lateral play.

A high-quality artisanal alligator or calf leather strap, worn daily, maintains structural integrity for 3-4 years. Durability depends on exposure to sweat, moisture, and repetitive movements. A shell cordovan strap, due to fiber density, can reach 5-6 years. Maintenance with specific leather creams significantly extends its useful life.