Strap for Seamaster Aqua Terra 150M Master Chronometer Small Seconds 38 Sedna Gold - Diamond / Pink / Bracelet

The lug width is precisely 19mm. This means the space between the two spring bars that attach the strap to the case is 19mm. If you wish to verify it, use a digital caliper and measure perpendicularly along the case axis, from outer spring bar to outer spring bar. Incorrect measurement compromises strap fit and aesthetic proportion.

Alligator is the supreme choice for Sedna Gold: the natural grain creates a chromatic dialogue with rose gold without dissonant contrasts. If you prefer practicality and patina developing naturally over time, vegetable-tanned calf offers robustness and a more understated appearance. Shell cordovan is ideal if you seek durability and an intrinsic sheen that recalls the warmth of the metal case.

Use two flat-tipped tools (spring bar remover tools) to depress simultaneously the internal springs of the spring bars, pushing them toward the case center. Extract the spring bars from the top of the case. Insert the new strap with one spring bar at a time, ensuring the springs snap into their slots. If the lug width is 19mm, the strap's inner keeper must be proportioned to avoid excessive lateral play.

Yes. Any high-quality artisanal strap with 19mm lug width is compatible. Ready-to-ship straps are available online in alligator, calf, shell cordovan, and NATO with 19mm lug width. For perfect fit, the Casati Milano atelier creates bespoke straps based on your wrist anatomy and leather preferences.

A quality leather strap, worn regularly (5-6 days per week), has an average lifespan of 3-5 years. Alligator and shell cordovan last longer thanks to their dense fibrous structure. Vegetable tanning develops a patina that enhances aesthetics but may slightly reduce resistance in flex zones. Regular maintenance (drying after perspiration, annual conditioning) significantly extends lifespan.