Omega
Seamaster 120M 2501.31.00— lug 18mm

The lug width of the Seamaster 120M 2501.31.00 measures 18 mm from shoulder to shoulder on the inner case. This dimension is critical for strap compatibility: even half a millimetre of deviation causes excessive tension or play. It is essential to verify the measurement before ordering the strap.

It depends on use and aesthetic context. Black alligator creates formal elegance and visual discretion; vegetable-tanned calf offers warmth and daily versatility, ideal if you desire an evolving patina; shell cordovan guarantees backlighting lustre and tactile density; NATO or rubber maintain submarine authenticity. The best choice reflects how you will wear the watch.

Remove the spring bars from the lug hole with a delicate tool (plastic bar or dedicated tool), pushing from the inside outward. Once the lugs are freed, the old strap detaches. Insert the new strap and reintroduce the spring bars, ensuring they are fully seated in their slots. Verify that the strap is exactly 18 mm in width.

Yes, provided the width is precisely verified at 18 mm from shoulder to shoulder. Quality artisanal straps custom-built often offer superior construction refinement compared to original Omega replacement straps and allow you to personalise material, colour and patina according to your aesthetic taste and context of use.

A quality leather strap (alligator, vegetable-tanned calf, shell cordovan) maintains full functionality and aesthetics for 18–24 months of daily or regular use, with variability based on climate, personal perspiration and stresses. Vegetable-tanned leathers develop visible patina over months, telling the story of use. A well-constructed artisanal strap lasts far longer than standard industrial straps, with the possibility of regeneration or replacement of worn components.