Strap for Seamaster Aqua Terra 150M Co-Axial 30 Red Gold / Diamond / MOP

The lug width measures 20mm. This is the distance between the lugs at the point where the bracelet is inserted. To verify, position a digital caliper inside the two lugs: the result should be 20mm ±0.1mm. This lug width does not vary regardless of the case color (rose gold in this case) or dial.

A dark brown or cognac alligator is the most aesthetically appropriate choice to respect the chromatic balance of 18-karat rose gold. The alligator grain, with regular scales, does not compete with the teak deck dial. For absolute versatility, a vegetable-tanned calf leather in tobacco offers a patina that evolves over time and harmonizes with the chromatic stratification of gold. If you prefer a radical change, a quartzite gray NATO transforms the model into a weekend tool while maintaining structural stability.

Use a spring bar tool, inserting the bifurcated tip into the relief holes of the lugs, one at a time. Press gently downward to open the spring bar mechanism, then pull out the bracelet end. Repeat on the opposite lug. For installation of the new bracelet, insert the spring bar from above, ensuring that both pins are firmly seated in the holes. Do not force: if the bar does not enter smoothly, verify the alignment. Work on a soft surface (microfiber cloth) to avoid scratches on the rose gold case.

Any bracelet with a 20mm lug width is technically compatible with the Omega Aqua Terra 231.58.30.20.55.001. However, to preserve aesthetic authenticity and construction quality, we recommend premium materials such as alligator, vegetable-tanned calf leather, shell cordovan, or FKM rubber. Avoid low-quality synthetic bracelets that develop plastic odor and have inadequate grip. On milanostraps.it you will find a curated selection of 20mm bracelets ready for shipment or customizable at the Casati Milano atelier.

Durability depends on the material and usage. An alligator with vegetable tanning subjected to regular maintenance (monthly cleaning with a damp cloth, conditioning with neutral wax 2-3 times a year) can last 5-8 years before requiring replacement due to fiber wear. Calf leather has a slightly shorter lifespan (3-5 years) due to lower fiber density. Shell cordovan, thanks to its natural density, can last 8-10 years. FKM rubber has greater resistance to sweat and sun exposure, with a lifespan of 4-6 years. Critical factors: direct sun exposure, frequent contact with fresh/saltwater, and frequency of use.