Strap for Seamaster Aqua Terra 150M Master Chronometer 38 Stainless Steel / Summer Blue / Bracelet

The lug width is 19 mm. This dimension is specific to this model in the 38 mm case size and is incompatible with 18 or 20 mm straps. To measure it, position a caliper inside the case between the lugs, measuring transversely from one side to the other.

The choice depends on use: black or dark brown alligator represents the luxury and formal solution; vegetable-tanned calf leather offers visible aging over time; black rubber amplifies the sports character; canvas NATO allows for quick adjustments. With an anthracite dial and white indices, calf leather and alligator are the most versatile choices.

The change requires a spring bar tool (or a thin flat tool) to lift the terminals of the old strap from the case lugs, and a small hammer to insert the new terminals with the replacement strap. The operation requires no specialized skills, does not affect the warranty, and takes just a few minutes. For measurements or complex details, the Casati Milano atelier offers assisted strap changes.

Yes, milanostraps.it offers a collection of artisanal 19 mm straps in alligator, vegetable-tanned calf, rubber, and NATO, ready to ship and customizable in size, initials, and choice of stitching thread. All straps are built to accommodate standard Omega terminals without structural modifications.

A quality leather strap, worn in rotation with other straps, typically lasts 3–5 years before requiring maintenance or replacement. Vegetable-tanned calf tends to patina positively over time, softening and developing warm tonal depth. Alligator, being more robust, can last 7–8 years if subjected to periodic maintenance with vegetable oil conditioning.