Strap for Seamaster Aqua Terra 150M Master Chronometer 41 Stainless Steel / Green / Alligator

The lug width of this model is 20mm. This is a specific measurement calculated in proportion to the case diameter (41mm) and the depth of the lugs. It is essential to verify this measurement before purchasing a strap, as 22mm straps are not compatible.

For this model we recommend high-quality alligator (fine and symmetrical grain) in dark brown tones, vegetable-tanned calf leather for patina development over time, or shell cordovan for maximum durability and mirror-like brilliance. For intensive use and humid environments, an embossed rubber strap offers superior practicality while maintaining technical elegance.

The strap is changed by extracting the spring bars that connect the strap to the case lugs. Use a dedicated tool (spring bar tool) to apply controlled pressure and release the pins. Position the new strap by aligning it with the bars and reinsert the spring bars until they click into place. Avoid hammers or sudden pressure that could scratch the case.

Yes, you can find 20mm straps online specifically designed for this geometry. Milanostraps offers ready-to-ship straps in various materials (alligator, calf, shell cordovan) customizable in sizes and details. For a fully custom strap, the Casati Milano atelier creates bespoke pieces with direct consultation and 18-month warranty.

A high-quality alligator or calf leather strap typically lasts 3-5 years with daily wear, developing patina and character over time. Shell cordovan is more durable and can last 5-7 years. Longevity depends on exposure to humidity, cleaning frequency, and tanning quality. Straps crafted by experienced artisans tend to last longer than industrial straps.