Strap for Seamaster Diver 300M Automatic 44 Racing Chronometer Stainless Steel / Black / Rubber / America's Cup

The lug width of the Seamaster Diver 300M 2869.50.91 is exactly 20 millimetres. Verify the pin length and any asymmetry with a digital caliper before ordering the strap, to ensure a perfect fit without play or excessive tension.

For a 44mm chronograph in satin brushed steel, polished black alligator with ivory stitching offers maximum formality. If you prefer natural ageing, vegetable-tanned calf leather in cognac brown develops a noble patina. For frequent water activities, FKM rubber or mercerised cotton NATO ensure absolute practicality.

Remove the pins with a spring bar tool, inserting the small lever into the lateral hole of the case to release the internal spring. Extract the pin completely, slide off the old strap, position the new one and reinsert the pin by pushing until you hear the spring click. Verify that both sides are secured uniformly.

Yes, any 20mm strap of good quality (alligator, calf, rubber, NATO) is compatible with the 2869.50.91, provided the pins match the length and geometry of the Omega case. Avoid straps with excessive thickness that could create structural tension.

A professional quality alligator or calf leather strap lasts 5–7 years in daily use, with predictable but elegant ageing. Vegetable tanning resists moisture better than chrome tanning. To extend the lifespan, avoid repeated immersions, always dry the strap after contact with fresh water, and apply protective balm every 6–12 months.