Strap for Seamaster Aqua Terra 150M Co-Axial 38.5 Annual Calendar 38.5 Stainless Steel / Silver

The lug width is 20mm. This width is specific to the Aqua Terra 231.13.39.22.02.001 model and has been calibrated by Omega to maintain balanced optical proportions between the 38.50mm diameter and the strap. Measuring the lug width is essential: position a digital caliper between the two case lugs at 12 o'clock and 6 o'clock, where the strap attaches. Any 20mm strap will be compatible with your spring bars.

Alligator represents the most coherent choice: the scale texture naturally dialogues with the teak dial, creating narrative continuity. For extreme formality we recommend black or dark brown alligator. If you prefer leather that ages and develops patina, vegetable-tanned calf is ideal, especially in burgundy or chocolate brown tones. For summer or water use, black FKM rubber straps maintain the elegance of the case without compromising comfort.

Remove the original strap by disengaging the 1.8mm pins that lock it using a spring bar tool or dedicated strap remover. Installing the new 20mm strap is the reverse operation: align the strap lug holes with the case lugs and insert the pins until you feel the locking click. If you are not experienced, the Casati Milano atelier offers strap change service on-site, ensuring proper tension and absence of stress on the case.

Yes, any strap with a 20mm lug width is compatible with the Aqua Terra 231.13.39.22.02.001. On milanostraps.it you will find straps ready to ship in alligator, calf, rubber and natural materials, all customizable in sizes and finishes. Compatibility is guaranteed by the standardization of lug width: simply verify that the strap is cut for 20mm width and you will have a perfect fit.

Durability depends on material and use. A quality alligator or calf strap, worn daily in a non-aggressive environment, maintains structural integrity for 5-8 years. Vegetable-tanned leather develops patina and aesthetic cracking after 3-4 years, but remains functional. FKM rubber straps last 3-5 years before stiffening from UV exposure. The Casati Milano atelier guarantees 18 months on custom straps. Variables such as humidity, perspiration and storage significantly affect longevity: keep the strap in a dry environment when not worn.