Strap for Seamaster Aqua Terra 150M Co-Axial 43 Annual Calendar Stainless Steel / Red Gold / Grey / Bracelet

The lug width of the Omega Aqua Terra 231.20.43.22.06.001 is 21mm. This measurement represents the distance between the two inner lugs that anchor the strap to the case. To verify it, use a digital caliper positioned perpendicular to the case, excluding the outer shoulders. All straps compatible with 21mm lug width will fit this model perfectly.

For the two-tone red gold and steel version, we recommend a cognac alligator that enhances the warm reflections of the gold, or a black calf with vegetable tanning for maximum formal sobriety. Alternatively, naturally aged shell cordovan develops a patina that dialogues elegantly with the two-tone over time. For summer contexts, black rubber with fine texture maintains the sporty silhouette while preserving the authority of the case.

Position the watch with the lug side facing upward. Use a spring bar tool to release the tension spring of each lug. Insert the flat tip of the tool between the lug and the case, gently pushing downward to free the spring. Remove the lug and the strap will come out easily. To mount the new strap, insert the lugs into the new strap's lug holes and use the tool to push the lug into the case shoulder until the spring clicks into place. Repeat for the other side. The process requires just a few minutes of practice.

Yes, any strap with a 21mm lug width is compatible with the 231.20.43.22.06.001. It is essential to verify that the lug width is exactly 21mm, as even a 1mm difference would cause misalignment or instability. Quality artisanal straps fit perfectly onto the original Omega lugs without requiring any case modifications. We recommend checking the strap's technical specifications before purchase.

The lifespan depends on the material and usage: a quality alligator or shell cordovan with vegetable tanning lasts 3-5 years in daily wear, developing a fascinating patina over time. An aniline calf lasts 2-4 years, as this leather is more sensitive to wear. Replacement is recommended when the strap shows tears, thinning at the lug attachment points, or loss of buckle elasticity. Proper storage (dry, away from direct light) and periodic application of colorless balm preserves the leather's structure and significantly extends its lifespan.