Strap for Seamaster Aqua Terra 150M Master Chronometer Small Seconds 38 Stainless Steel / Sedna Gold / Green - Diamond / Alligator

The lug width measurement for reference 220.23.38.20.60.001 is 19 mm. This width is standard in the Seamaster Aqua Terra collection in the 38 mm version and must be measured precisely between the two inner lugs to ensure compatibility. Incorrect measurement of the outer edges of the lugs frequently leads to ordering incompatible straps.

For this two-tone reference, alligator represents the finest choice: the natural and regular grain enhances the luminosity of Sedna gold without competing with the wave dial. Shell cordovan offers chromatic depth and stability over time, while vegetable-tanned calf provides greater softness and aesthetic evolution capability. Rubber or NATO remain valid for controlled sports contexts.

The strap is changed by removing the spring bars from the lugs. Use a spring bar tool or small flat implement to press the internal spring mechanism of one pin at a time, extracting it from the lug hole. Once free, remove the old strap and insert the new one by aligning the holes to the lugs. Reinsert the pins until the locking click. If you are unsure of the procedure, the Casati Milano atelier offers this service.

A quality aftermarket strap is completely compatible with the 220.23.38.20.60.001 as long as it respects the 19 mm lug width. Many collectors prefer custom straps to diversify the watch's aesthetics without quality compromises. Casati Milano produces artisanal straps custom-made specifically for this reference, ensuring constructive consistency and durability.

The lifespan varies based on material and use: quality artisanal alligator or shell cordovan guarantees 3-5 years of regular use, with proper maintenance even longer. Vegetable-tanned calf tends to wear more quickly (2-3 years) if subjected to frequent humidity, while rubber or NATO remain stable for 2-3 years before losing elasticity. The Casati Milano atelier provides an 18-month warranty on all produced straps.