Strap for Seamaster Aqua Terra 150M Co-Axial 30 Stainless Steel / Diamond / MOP

The lug width of the 231.18.30.20.55.001 model is 18mm. This measurement is crucial for strap selection and ensures the correct aesthetic proportions between the case and strap. It is measured by placing a digital caliper between the inner shoulders of the lugs, at the attachment point.

For the 231.18.30.20.55.001 model, we recommend Nile alligator in chocolate brown or black tones to enhance the teak-inspired dial, vegetable-tanned calf leather in white or cream for a luminous daytime effect, and shell cordovan in burgundy for those who appreciate the chromatic evolution of patina over time. Charcoal grey NATO fabric remains the most versatile option for daily rotation.

Strap replacement requires the use of a springbar removal tool. Position the tool in the small slot located laterally on the lug, gently push downward to compress the internal spring of the springbar, then extract the springbar from the case. Repeat the procedure for the other lug. Insertion of the new strap is performed in reverse, ensuring that the springbar seats perfectly in both lugs.

Yes. 18mm straps are widely available in the aftermarket. For the Omega Aqua Terra 231.18.30.20.55.001 we recommend artisanal pressed leather or fabric straps, carefully crafted at the lug attachments. Always verify that the strap thickness is compatible with the case dimensions: excessively thick straps will create unwanted protrusions.

A quality leather strap, worn regularly on a daily basis, maintains structural integrity for 4-6 years. Exposure to moisture, perspiration, and sunlight accelerates aging. A vegetable-tanned strap develops a natural patina that enhances its aesthetic over time. Casati Milano atelier provides an 18-month warranty on all bespoke straps, covering manufacturing defects and premature wear.