Omega
Seamaster 120M 2521.81.00— lug 18mm

The lug width is 18 mm on both sides. This measurement is specific to mid-size Seamaster models from the 1970s. You can verify it by placing a ruler on the inner surface of the lug, in the narrowest area where the strap makes contact, excluding the lateral shoulders.

Vegetable-tanned alligator represents the most fitting choice: medium grain, patina that evolves over time. Shell cordovan suits equally well for durability and natural lustre. Alternatively, FKM rubber for direct sports use, or ballistic NATO for resonance with the watch's technical heritage.

The change requires minimal tools: a small flat-blade screwdriver, preferably with rounded tip, and a case holder that stabilizes the watch without scratching. Insert the screwdriver into the small lateral slot of the pin that secures the strap to the lug, and release the pin outward with controlled movement. Proceed the same way on the opposite lug.

Yes, provided that the lug width is exactly 18 mm. Many modern standardized straps (20 mm or 16 mm) will not fit correctly. On milanostraps.it you will find artisanal straps designed specifically for this measurement, with construction finishes that respect the original Omega proportions.

A high-quality alligator or cordovan strap, subject to ordinary maintenance (occasional cleaning, drying after water contact), maintains structural and aesthetic integrity for 5-7 years with regular use. FKM rubber typically lasts 4-6 years before losing elasticity. Lifespan also depends on the intensity of sun exposure, humidity, and temperature fluctuations.