Strap for Seamaster Aqua Terra 150M Co-Axial 30 Stainless Steel / Yellow Gold / Grey / Bracelet

The lug width of the 231.20.30.20.06.004 is 20mm. This specific width requires the selection of compatible 20mm straps: 18mm or 22mm straps will not fit without adapters. Precision in measurement is essential, as even a minor discrepancy compromises the buckle fit and the aesthetic harmony between case and strap.

The material depends on the intended use. For formal elegance and daily wear, we recommend vegetable-tanned alligator or shell cordovan, which age over time developing a unique patina. For sports use or greater practicality, vegetable-tanned Tuscan calf offers initial softness and durability, or silk NATO for complete resistance. The 231.20.30.20.06.004's grey Linen dial naturally pairs with warm tones (cognac, dark brown) or cool contrasts (navy blue, black).

The 231.20.30.20.06.004 is equipped with spring bars that secure the strap to the lugs. To change the strap, a specific tool is required (spring bar tool or precision instrument): compress the lateral spring, extract the spring bar from the lug, and reposition the new strap ensuring both spring bars are correctly seated. For those without technical expertise, we recommend support from a qualified watchmaking workshop.

Yes, any 20mm strap is physically compatible with the lug, provided the spring bars are standard. However, aesthetic compatibility is different: straps with excessive thickness or mediocre construction quality alter the proportional balance of the 30mm case. A handcrafted strap made respecting the original thickness (approximately 4-5mm) and material quality maintains the harmony designed by the Omega designer.

Longevity depends on the material and use. Quality vegetable-tanned alligator, with ordinary maintenance (occasional drying, protection from prolonged direct light), maintains functionality and aesthetics for 5-8 years. Shell cordovan, more resistant, can exceed 10 years. Tuscan calf, depending on frequency of use and exposure to external elements, typically lasts 4-6 years before requiring replacement. A deployant buckle has a longer lifespan if made from stainless steel or quality yellow gold.