Strap for Seamaster Diver 300M Automatic 41 Stainless Steel / Black / Bracelet / Japan

The lug width of the Omega Seamaster Diver 300M 2251.50.00 is 20 millimetres. This is the distance between the two lateral lugs of the case where the strap is inserted. You can verify it easily by measuring from inside to inside using a digital calliper or by comparing your watch with standard straps: a 20mm strap fits perfectly without excessive play.

The best strap depends on its use: for actual diving, the original Omega rubber or an alternative vulcanized FKM (Viton) strap remains unbeatable; for everyday elegance, a vegetable-tanned alligator or burnt earth brown calf leather in cognac tones creates a fascinating contrast with the blue or black dial; for maximum practicality, a NATO strap in nautical nylon offers quick changes and fast drying. Each choice should reflect your real lifestyle with the watch.

Gently remove the current strap by lifting the lateral keepers (the rubber or leather bars) from the lugs. It is not necessary to remove the spring bars: the keepers slide laterally. Once removed, insert the new strap of the same size (20mm) by sliding the keepers laterally onto the lugs. If the new strap uses a deployant clasp, ensure it is adjusted for your wrist before closing it around your wrist. No special tools are required.

Yes, any strap with a 20mm lug width is compatible with the 2251.50.00. The watch enthusiast community has developed an international standard for lug width measurements, so alligator, calf, NATO, rubber and cordura straps from third-party brands fit perfectly. The only caveat: ensure that the strap is not too thick (beyond 3-4 millimetres) to prevent the screw-down caseback from closing properly.

A quality leather strap (vegetable-tanned alligator or vegetable-tanned calf) typically lasts between 2 and 4 years of daily use, depending on the environment and care. If you wear the watch primarily in dry environments and protect the leather from frequent fresh water, the strap will develop a fascinating natural patina and increase longevity. Constant humidity and salt water reduce the lifespan to 18-24 months. Artisanal straps with vegetable tanning are designed precisely for this transition: they age with grace.