Strap for Seamaster Aqua Terra 150m Master Co-Axial 41.5 Stainless Steel / Yellow Gold / Champagne / Bracelet

The lug width is 20mm. This measurement represents the space between the spring bar fixing points and does not vary for this reference. It is important not to confuse the lug width with the bracelet width at the centre section, which on the Aqua Terra can reach 22mm. To verify, use a digital calliper inside the two springs.

It depends on your use and personal taste. For nautical elegance, brown or cognac alligator emphasises the wavy dial and two-tone finish. For everyday versatility with evolving patina, vegetable-tanned calf leather is ideal. For water sports and durability, synthetic rubber protects your primary strap. An anthracite grey Nato offers sporting simplicity without compromise. We recommend having at least two straps to maximise the expression of your Aqua Terra.

Obtain a spring bar tool (available online or at the atelier). Position the flat hammer end at one of the two lateral springs, press gently downward to extract the metal pin. Repeat on the other spring. Remove the old strap. Insert the new strap by aligning the holes, press both pins downward with the tool until they click into the lugs. The procedure takes 2-3 minutes. If you prefer professional service, Casati Milano performs the strap change with case inspection during the operation.

Yes, provided it is constructed with 20mm lug width. High-quality aftermarket straps are often preferable to original Omega straps for material variety and customisation. Always verify that the strap is specifically made for 20mm and that the fixing holes are correctly aligned to the case lugs. Avoid generic 'universal' straps that could present unwanted loosening.

Durability depends on the material and use. High-quality alligator lasts 5-8 years with ordinary maintenance (periodic cleaning and protection from excessive moisture). Vegetable-tanned calf can last 3-5 years before significant wear at the attachment point, but the patina it develops makes it aesthetically more interesting over time. Synthetic rubber has a lifespan of 7-10 years without significant degradation. To extend the life of any strap, alternate use with a second strap and allow the leather to dry completely after moisture exposure. Casati Milano offers an 18-month guarantee on its custom straps.