Strap for Seamaster Diver 300M Master Co-Axial 42 Stainless Steel / Grey / Rubber

The lug width is exactly 20mm. This is the distance between the lugs of the case, which is essential to ensure strap compatibility. To verify it correctly, place a digital caliper between the inner shoulders of the two case lugs: the distance must correspond to 20mm.

It depends on the use. For formal elegance, alligator with vegetable tanning offers natural texture and ennobling patina. For everyday versatility, calf with vegetable tanning guarantees comfort and visible aging. For intense water activities, a NATO in canvas or an FKM rubber strap resist chlorine and salt water better. Shell cordovan represents the ideal compromise between sportiness and refinement.

The Seamaster is equipped with spring bars, not screw bars. Proceed as follows: use a spring bar tool to insert the tip into the spring slot and push the pin downward, releasing one end of the lug. Extract the lug from the case. Repeat on the other side. Insert the new strap by passing the lug through the holder, ensuring the spring clicks into position. Verify that both sides are securely fastened before wearing the watch.

Yes, as long as the lug width is exactly 20mm. High-quality artisanal straps, such as those in alligator with vegetable tanning or shell cordovan, guarantee not only constructive compatibility but also an aesthetic and tactile upgrade compared to factory straps. Ensure that the strap has been made for this specific lug width.

A quality leather strap, such as alligator or calf with vegetable tanning, lasts an average of 3-5 years with daily wear. Durability depends on frequency of use, exposure to water, humidity, and maintenance care. Shell cordovan, thicker and more robust, can exceed 5 years. The patina that develops is a sign of natural and noble wear, giving character and uniqueness to the strap over time.