Strap for Seamaster 120M Automatic 36.25 Stainless Steel / Silver / Japan

The lug width of the Seamaster 120M 2501.33.00 is 18mm. This dimension is determined by the constructive proportions of the 36.25mm case and represents the standard for this generation of Seamaster. All compatible straps must respect this width to fit correctly on the lugs without play or lateral pressure.

Vegetable-tanned alligator is the most aesthetically and constructively coherent choice. The natural texture of the reptile leather dialogues with the classical proportions of the case. Alternatively, French calf offers a uniform surface for a more urban style, while shell cordovan adds a lustre that emerges under direct light. NATO straps remain functional but do not visually dialogue with the sophistication of the case.

To change the strap, remove the watch from your wrist and use a spring bar tool to extract the pins that secure the strap to the lugs. Insert the pin into the slot of the front lug of the new strap and reinsert the pin into the lug seat. Repeat the operation on the opposite side. Do not force: the lug must slide smoothly along the pin. If you are not confident, consult a watchmaker.

Yes, provided they respect the 18mm lug width. Specialist brands such as Milanostraps offer artisanal compatible straps, made from premium leather with customizable finishes. Always verify that the external width of the strap is 18mm and that the lugs are sized to accommodate the watch pins without excessive friction.

The lifespan depends on the intensity of use and the quality of the leather. An alligator or calf strap made with vegetable tanning, worn daily, offers average resistance of 18-24 months before requiring replacement. Leather wears naturally through contact with sweat and moisture. Shell cordovan, being more resistant, can last 30-36 months. Periodic maintenance (gentle cleaning, conditioning) significantly extends service life.