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

The lug width is exactly 19 millimeters. This measurement represents the internal distance between the two attachment holes of the strap on the case. To verify the compatibility of an aftermarket strap, measure the internal diameter of the lugs with a caliper: it should be between 18.8 and 19.2mm for correct fit without excessive tension.

The choice depends on your use. For formal settings, a vegetable-tanned alligator in honey brown amplifies the luminosity of the Sedna Gold. For everyday versatility, a vegetable-tanned black calf offers neutral chromaticity. For marine environments, a polyamide NATO strap is functional. A petrol blue strap creates harmony with the sunburst dial without monotony. The Casati Milano atelier personalizes every choice based on your wrist and your needs.

Remove the attachment pin (spring bar) using a dedicated tool (spring bar tool): position the flat tip in the pin's groove and lift upward. The pin will slide laterally, releasing the old strap. Replace with the new strap by inserting the pin into the attachment holes of the case and strap, then ensure the pin is locked symmetrically. If you are not experienced, the Casati Milano atelier offers fitting by appointment.

Yes, provided the lug width is actually 19mm (not 20mm as sometimes incorrectly stated for the 220.20.38.20.56.001). Verify by measuring the attachment holes with a caliper. Milanostraps offers various options in leather and rubber specifically calibrated for 19mm, with artisanal tolerances that guarantee fit without lateral play.

A quality vegetable-tanned leather strap (alligator, calf, shell cordovan) lasts 2-5 years with daily wear, depending on frequency of use and climatic conditions. Constant humidity reduces durability; dry climates prolong it. The Casati Milano atelier provides an 18-month warranty on all artisanal straps and offers regeneration services (re-oiling, re-stitching) that further extend useful life.