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

The lug width of the Omega Aqua Terra 231.13.39.21.55.002 model is 18mm. This is the space between the two internal lugs of the case. Any compatible strap must have perforated ends to accommodate standard 1.5mm diameter pins.

We recommend vegetable-tanned alligator for formal elegance, box calf for contemporary versatility, or synthetic rubber for water resistance. The choice depends on intended use: leather for smart-casual and business, rubber for summer sports and humid environments.

To change the strap, proceed as follows: 1) Obtain a spring bar tool (dual-tip instrument) specifically designed for watches. 2) Invert the watch on your wrist or on a cloth. 3) Insert the tool tip under the pin, applying gentle pressure to open the internal spring. 4) Slide the pin out of the strap lugs. 5) Repeat for the other side. 6) Insert the pins into the new strap and reinsert them into the case holes.

No. Although the nominal lug width is 18mm, true compatibility depends on the exact pin diameter (typically 1.5mm), the geometry of the strap lugs, and the distance between the holes. A non-Omega-calibrated strap may fit poorly. We recommend straps explicitly certified as Omega-compatible or custom-made by specialized artisans.

A premium quality leather strap (alligator with vegetable tanning or vegetable-tanned calf) lasts an average of 3–5 years with daily wear and ordinary maintenance. Factors such as sun exposure, humidity, skin perspiration, and cleaning frequency affect longevity. Synthetic rubber offers greater durability (5–8 years), while NATO straps last 2–3 years before visible wear becomes apparent.