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

The lug width of model 231.20.30.20.55.003 is 18mm. This measurement represents the vertical distance between the two case lugs where the strap is attached via spring bars. It is essential to respect this measurement to ensure proper assembly and aesthetic harmony of the watch.

For this model we suggest alligator in dark brown or black tones, which creates a sober dialogue with the bi-material case. Shell cordovan in bordeaux is ideal for emphasizing the rose gold, while vegetable-tanned calf leather offers patina that evolves over time. For summer use, technical NATO straps or vulcanized rubber respect the Aqua Terra's nautical DNA.

The strap is secured by two spring bars that pass through the case lugs. Using a spring bar tool, gently press the small button on the tip of the tool, insert it into the lug opening and rotate to release the spring bar. Once extracted, the strap detaches. The reverse operation allows you to install the new strap. If you are not experienced, a professional watchmaker can complete the change in a few minutes.

Yes, any strap with an 18mm lug width is compatible with this model. Milano Straps provides a wide range of handcrafted 18mm straps made from premium leather, customizable in length, initials and thread type. The Casati Milano atelier also offers bespoke service with personal leather selection and 18-month warranty.

A high-quality leather strap (alligator, cordovan, vegetable-tanned calf) worn daily typically lasts 2-4 years, depending on humidity, sun exposure and maintenance frequency. The leather tends to darken and develop patina over time, confirming the authenticity of the material. Milano Straps guarantees their straps for 18 months. You can extend the lifespan with periodic maintenance: avoid prolonged immersion in salt water, dry quickly after accidental contact and occasionally apply a balm for vegetable-tanned leather.