Strap for Seamaster Aqua Terra 150M Co-Axial 44 Chronograph Stainless Steel / Red Gold / Grey / Bracelet

The lug width for this model is 20mm. Measure the distance between the two attachment holes on the case: it must be exactly 20mm from lug to lug. This width is the standard for large-diameter sports watches (44mm) and allows the strap to proportion correctly to the case.

A medium brown alligator or vegetable-tanned calf leather are the most coherent choices. Dark brown alligator on a steel deployant clasp emphasizes the two-tone duality of the case, while light tan calf with a Sedna Gold deployant maintains a more precious chromatic dialogue. For sporty wear, navy rubber with military nylon loops respects the model's nautical heritage.

The Aqua Terra is fitted with integrated, non-removable lugs. The strap attaches via two lateral holes using a spring bar. To change it: gently remove the spring bar by pushing a lever into the lug hole, slide out the old strap, insert the new one by aligning the hole with the spring bar, and reposition the bar. If you are uncertain, Casati Milano performs the change by appointment.

Yes, provided the strap is sized for 20mm lugs and the hole is compatible with standard spring bars. A quality artisanal strap in alligator, calf, or cordovan equivalent to (or superior to) the original Omega strap is a common and recommended choice by milanostraps.it, which offers straps specialized for this configuration.

Durability varies based on material and use. Well-maintained alligator lasts 4–6 years with regular daily wear. Vegetable-tanned calf develops visible patina in 12–18 months but can last 5–7 years. Cordovan, being naturally water-resistant, can exceed 6–8 years. The atelier Casati Milano offers an 18-month warranty on all straps and recommends replacement when the leather begins to show micro-tears at the bottom of the hole.