Strap for Seamaster 120M Quartz 36.25 Yellow Gold / White

The lug width of the Seamaster 120M 2111.21.00 is strictly 18 mm. This width is measured internally between the two anchorage points of the case. It is essential to verify that any aftermarket strap has an internal width of 18 mm to ensure proper fit without excessive play or insertion difficulty. Always consult official Omega documentation for confirmation.

For a timepiece of this caliber in yellow gold, vegetable-tanned alligator represents the most refined pairing: the natural grain dialogues harmoniously with the golden texture of the case, and the parallel aging of the two components creates a coherent visual narrative over time. Alternatively, Japanese shell cordovan in burgundy or bordeaux tones offers sophistication with that inner luminosity that emerges progressively. For summer wear, hazelnut or beige grained calf maintains elegance with greater visual lightness.

Strap replacement requires a spring bar tool, a specific instrument with a fine tip that allows compression of the small springs (spring bars) that keep the strap anchored to the lugs. Position the tip in the groove of the lug, gently compress the spring, and slide the strap out of the lug. For installation of the new strap, align the holes with the lugs and push until the spring bar clicks into place with a perceptible snap. This delicate operation is best delegated to a professional if you lack familiarity with the tool.

Yes, provided the strap is manufactured specifically with 18 mm lug width. Aftermarket straps—in alligator, calf, shell cordovan, NATO or rubber—are fully compatible if you verify the internal width of the lugs. Numerous artisanal manufacturers offer customizable straps in leather and color, allowing you to transform the appearance of the watch while maintaining its technical integrity and value. Always check the manufacturer's specifications before purchase.

A quality leather strap offers average durability of 3-5 years under regular conditions of use, with significant variations depending on climate, frequency of use, and type of tanning. Vegetable-tanned alligator tends to last longer than chrome-tanned calf, thanks to superior fiber density and natural aging that makes it more resistant over time. Vulcanized rubber maintains structural integrity for 5-7 years before showing failures in the fastening system. Regular maintenance—gentle cleaning and periodic conditioning for leather straps—significantly extends longevity.