Strap for Seamaster Aqua Terra 150M Shades Master Chronometer 38 Stainless Steel - Sedna Gold / Rose / Bracelet

The reference 220.50.38.20.10.001 in 38mm Sedna Gold version has a lug width of exactly 19mm. This measurement is fixed for all examples in the series and determines compatibility with aftermarket straps. Always measure perpendicular to the spring bar length, at the case seat, to obtain the precise value.

For the Sedna Gold with sunburst blue dial, dark brown alligator (mahogany) is the most elegant choice as it enhances the warmth of the gold without competing chromatically. For those preferring everyday versatility, vegetable-tanned calf leather in cognac tone offers better adaptability and develops natural patina over time. Bordeaux shell cordovan represents the compromise between formal elegance and contemporary sportiness.

Remove the original strap by inserting a spring bar removal tool into the lateral holes of the case, directly under the attachment lugs. Gently push upward to extract it one side at a time. The new 19mm strap is inserted the same way, ensuring the spring bars are fully seated in their housings on both sides. Avoid sudden pulling to prevent scratching the gold case.

Yes, all straps with 19mm lug width are compatible with the 220.50.38.20.10.001. Ensure the strap has been measured correctly (perpendicular to the spring bar length) and that the spring bars are able to lodge securely in the case holes. Artisanal quality straps, such as those in alligator, calf, or shell cordovan, offer better fit compared to budget straps.

A natural leather strap (alligator, calf, shell cordovan) without synthetic treatments lasts on average 18-36 months depending on frequency of use and sun exposure. Vegetable-tanned leather, thanks to its greater fiber density, tends to last longer than chromium treatments. Moisture, sweat, and prolonged water exposure significantly reduce durability. An FKM rubber strap offers superior durability (3-5 years) but requires maintenance to preserve flexibility.