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

The lug width of this model is 19mm. It is measured from the inner edge of one lug to the inner edge of the other. This width is specific to the 38mm case geometry and requires bespoke straps, not standardized ones.

African alligator with vegetable tanning is the ideal choice for this satin-brushed steel case: the natural grain creates tactile contrast and develops a patina in harmony with the case itself. Red horse shell cordovan or shadowed calf are elegant alternatives for formal wear.

The strap is secured by two spring bars anchored to the case lugs. You will need a tool called a spring bar remover: insert it into the lateral slots of the lugs, gently push the bar toward the center, and remove the old strap. Align the new strap and reinsert it in the same manner, ensuring that both ends of the bar are locked in place.

Yes, any quality 19mm strap is mechanically compatible. Aesthetic compatibility, however, depends on leather thickness and strap height relative to the lugs: very thick leathers can create friction. Casati Milano straps are dimensioned specifically for this model, with harmonious curves and proportional thicknesses.

An alligator or shell cordovan strap, with regular maintenance (drying after water contact, conditioning every 6–12 months), lasts 3–5 years in daily wear. Vegetable-tanned leather tends to last longer than synthetic tanning. Casati Milano offers an 18-month warranty on the strap and allows renewal services such as spring bar replacement.