Strap for Seamaster Aqua Terra 150M Co-Axial 38.5 Stainless Steel / Red Gold / MOP

The Omega Aqua Terra 231.23.39.21.55.001 features a lug width of exactly 20 millimetres. This measurement is determined by the distance between the case lugs and represents the critical specification for compatibility with any aftermarket strap. Measuring the lug width correctly with a digital caliper ensures perfect fit of your selected strap.

For the opalescent mother-of-pearl dial of this model, alligator in cognac brown or burgundy tones represents the most elegant choice, amplifying the jewelled character of the rose gold case. Alternatively, vegetable-tanned calf in grey or black tones maintains aesthetic simplicity, allowing the mother-of-pearl to shine undisturbed, while natural rubber offers sporting versatility without chromatic competition.

Strap replacement requires the use of a dedicated spring bar tool. Locate the small slots on the sides of the case lugs, gently insert the tool to compress the spring inside the bar, then extract the bar itself. Repeat the operation on the other side. Insert the new strap's bars into the lugs and verify they are fully seated. If you lack the tools, a specialised craftsman (such as Casati Milano) performs the change with certified precision.

Any strap with a 20 millimetre lug width is physically compatible with the Omega Aqua Terra 231.23.39.21.55.001. On milanostraps.it you will find a selection of straps in alligator, calf, natural rubber and NATO fabric all certified for this exact specification. Compatibility is absolute when the lug width matches the 20mm specific to this model.

The lifespan of a leather strap depends on the material and usage. Quality alligator with vegetable tanning maintains functionality and aesthetics for 5-7 years with moderate daily use; vegetable-tanned calf resists for 4-6 years; vulcanised rubber exceeds 10 years. Exposure to moisture, perspiration and UV rays accelerates ageing. The 18-month warranty offered by Casati Milano covers manufacturing defects, while natural leather wear follows the biological cycle of the raw material itself.