Strap for Seamaster Aqua Terra 150m Master Co-Axial 38.5 Stainless Steel / Yellow Gold / Silver

The lug width of the Omega Aqua Terra 231.23.39.21.02.002 is exactly 20mm. This width is measured internally between the two lugs that support the strap. It is essential to verify this dimension before purchasing an aftermarket strap, as even a 1mm difference would make the strap incompatible or unstable.

For a two-tone Aqua Terra in yellow gold and steel, the most balanced pairings are black alligator with white stitching (formal), vegetable-tanned calf in cognac tones (versatile), or shell cordovan in burgundy (sports elegance with natural patina). These materials balance the sophistication of the wave dial without competing visually with the two-tone case.

To change the strap, you need a dedicated spring bar tool to remove the pins from their original seats. Position the watch on a soft surface, insert the tool into the small hole on the side of the lug to compress the internal spring, extract the used pin, and insert the new strap by aligning it to the seats. The procedure requires precision to avoid scratching the case.

Yes, any strap with a 20mm lug width is compatible with reference 231.23.39.21.02.002, regardless of material (alligator, calf, shell cordovan, rubber). What matters is verifying that the lug width is actually 20mm and that the pins have the correct diameter (standard 1.8mm). Milano Straps offers hand-crafted 20mm straps customizable in leather and colors.

A high-quality leather strap (alligator, vegetable-tanned calf, shell cordovan) has an average lifespan of 4-8 years with regular daily use. Shell cordovan, being a denser leather, tends to last longer (8-10 years). Alligator requires more maintenance but maintains aesthetics and functionality for 5-6 years. Casati Milano provides an 18-month warranty on all hand-crafted personalized straps.