Strap for Seamaster Aqua Terra 150M Co-Axial 38.5 Yellow Gold / Diamond / Black

The lug width of this model is 20 mm. It is measured from the inner shoulder of one lug to the other, at the point where the strap actually rests on the case. For the Aqua Terra 231.58.39.21.51.002, it is essential to respect this dimension to ensure correct aesthetic and functional pairing without lateral play.

To enhance the 18-karat yellow gold, we recommend red or burgundy alligator (natural grain and warm color), brown shell cordovan that develops patina over time, or vegetable-tanned calf leather for a structured aesthetic. Vulcanized rubber in grey or black maintains the original sporty character of the Aqua Terra model.

Strap replacement requires the use of a spring bar tool specific for watches. Position the Aqua Terra on a soft mat, gently remove the suspension pins from both sides of the case, and remove the strap. Insert the new strap (20 mm lug width) by first passing a pin through the lower hole, then flex the case and close the upper pin. Avoid forcing to prevent scratching the gold case.

Yes, provided it respects the 20 mm lug width. High-quality artisan aftermarket straps, such as those made from alligator, shell cordovan, or vegetable-tanned calf leather, do not damage the case and offer greater aesthetic customization compared to original Omega bracelets.

A high-quality leather strap (alligator, cordovan, vegetable-tanned calf) typically lasts 3–5 years with daily wear, depending on exposure to moisture, sweat, and temperature fluctuations. Milano Straps offers an 18-month warranty on custom straps, and natural materials develop a fascinating patina over time if maintained properly.