Strap for Seamaster Aqua Terra 150M Master Co-Axial 38.5 Red Gold / MOP / Diamond

The Omega Aqua Terra 231.55.39.21.55.001 features an 18mm lug width, determined by the spring bar width and the 38.50mm case geometry. This measurement is standard for all Aqua Terra models in the 38.5 configuration and ensures universal compatibility with any 18mm-wide strap.

High-grade alligator and vegetable-tanned calf leather are the ideal materials for this model. Alligator accentuates the jewel-like texture of rose gold, while calf leather develops a layered patina over time. For sports contexts, high-density FKM rubber maintains water resistance without compromise. The best color pairings range from cognac brown to navy blue, following the dial tone.

The strap is changed by extracting the spring bars (small elastic metal pins) from the case lugs. Using a spring bar tool, apply gentle pressure to release the pin from one side, allowing you to remove the old strap and insert the new one. This is a straightforward operation but requires care to avoid damaging the case. Alternatively, a professional watchmaker can complete the change in a few minutes.

Any strap with an 18mm lug width is compatible with the 231.55.39.21.55.001. We recommend artisanal straps in Italian leather, alligator, shell cordovan, or FKM rubber, capable of enhancing the aesthetic identity of the model. Always verify that the strap has appropriate length for your wrist and that the deployant is proportionate to the case.

Durability depends on the material and usage. A calf leather strap with vegetable tanning, worn regularly, maintains structural integrity for 3-5 years before requiring aesthetic refinishing. Alligator, being denser and more stable, lasts 5-7 years. FKM rubber guarantees 8-10 years of intensive use without degradation. Rotating between different straps significantly extends the life of each one, reducing concentrated wear.