Strap for Seamaster Aqua Terra 150M Co-Axial 30 Yellow Gold / Diamond / MOP / Bracelet

The lug width of the Omega Aqua Terra 231.55.30.20.55.002 is 18mm. This measurement represents the internal distance between the two attachment lugs on the case and determines strap compatibility. It is important to measure directly on the case using a digital caliper to ensure accuracy, not on the existing strap which may be worn.

For the 231.55.30.20.55.002 in 18-carat yellow gold, alligator remains the natural choice: the geometric texture of the leather amplifies the austere character of the watch. Black alligator with beige stitching, or chocolate, transforms the model into a sartorial object. Fine-grained calf offers versatility, while shell cordovan is ideal for those seeking a patina that develops naturally over time.

Strap replacement is performed by removing the attachment pins using a specialized precision tool or at a certified Omega service center. The procedure requires care to avoid damaging the case. Milano Straps offers consulting support and 18mm straps are ready for installation. For a risk-free experience, Casati Milano also provides assembly service at the atelier.

Any strap with a certified 18mm lug width is compatible, provided the buckle depth does not obstruct passage under the crown and the overall strap width (typically 16-20mm) does not create visual misalignment. Milano Straps supplies 18mm straps customizable in premium leathers (alligator, calf, shell cordovan) with an 18-month warranty and options for stitching, initials and custom colors.

Durability depends on leather quality and usage. Premium alligator or calf maintains structural integrity for 4-6 years with regular use, but develops visible patina within 6-12 months. Shell cordovan lasts even longer thanks to fiber density. Sun exposure, sweat and humidity accelerate aging. A Milano Straps strap with vegetable tanning is designed to age elegantly; Casati Milano guarantees 18 months of structural integrity and recommends replacement when the strap shows visible wear at the edges or buckle.