Strap for Seamaster Aqua Terra 150M Co-Axial 38.5 Stainless Steel / Black

The Omega Aqua Terra 231.13.39.21.01.001 features a 20mm lug width. This measurement is the available space between the lateral attachments of the case where the strap is secured. It is important to measure it precisely using a digital caliper or a millimeter ruler placed in the narrowest area of the lug, where the metal fixing pin slides through.

The best strap depends on usage: for pure elegance, vegetable-tanned alligator is the purist choice that respects the case proportions. Shell cordovan offers robustness and patina over time. Calf leather in brown or cognac tones creates interesting aesthetic contrast with the blue dial. For versatility in marine and daily use, vulcanized FKM rubber is the contemporary solution.

The strap on the Aqua Terra 231.13.39.21.01.001 is changed via the horizontal fixing pins that pass through the lugs. Using a dedicated tool (spring bar tool), depress the micro-spring of the pin, extract the pin from the lug holes, and insert the new strap. It is recommended to work gently to avoid scratching the case, especially on the polished finish.

Aftermarket 20mm straps are compatible if they respect a maximum width of 19.8–20.2mm. Straps made in alligator, shell cordovan, or vegetable-tanned calf with <a href="/pages/termine-glossario/deployante">deployante</a> (fold-over clasp) in satin-finished or polished stainless steel are recommended, in aesthetic coherence with the Omega case finish. Avoid straps in pure fabric or synthetic leather.

The lifespan of a leather strap depends on frequency of use and environmental conditions. A high-quality alligator or shell cordovan strap in vegetable tanning, worn daily, maintains functional integrity for 3–5 years. Exposure to salt water, chlorine, and humidity shortens useful life to 1–2 years. Vulcanized FKM rubber is more resistant, with a lifespan of 5–8 years even in marine conditions. Proper maintenance—quick drying after moisture contact, annual conditioning—significantly extends the strap's life.