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

The lug width of the Omega Aqua Terra 231.13.39.21.03.001 is 20 mm. This dimension is integral to this model and is measured as the internal distance between the case attachment lugs. Any aftermarket strap must respect this exact measurement to ensure a perfect fit without gaps or forcing.

For the Aqua Terra 231.13.39.21.03.001, alligator is the most natural choice thanks to its regular texture and inherent elegance that enhances the teak dial. Deep black shell cordovan is ideal for a more formal approach, while vegetable-tanned calfskin maintains a classic and aged patina. For more sporty uses, a heavy cotton NATO or FKM rubber strap remain consistent with the model's nautical vocation.

The strap is changed by removing the attachment lugs using a specific tool (spring bar tool). It is advisable to support the case with one hand while working, applying light pressure to avoid scratches on the brushed steel. If you are not experienced, Casati Milano offers the strap change service at the sartorial atelier in Milan, with personalized advice on materials and finishes.

Yes. The 20 mm lug width is a standard construction specification for Omega in this generation of Aqua Terra and remains unchanged. Any strap made for this specific measurement remains perfectly compatible. If you change watches, you will still be able to use the strap on other models with identical lug width.

A quality leather strap (alligator, calfskin, shell cordovan) typically lasts 3-5 years of regular use, depending on exposure to sweat, moisture and sunlight. Aging is not a defect but a desirable characteristic: the patina that forms increases aesthetic value. Casati Milano offers an 18-month warranty on handcrafted straps and allows selective replacement of components (buckle, lugs) to extend useful life.