Jaeger-LeCoultre
Master Ultra Thin 13635E1— lug 20mm

The Jaeger-LeCoultre Master Ultra Thin 13635E1 is fitted with a 20 mm lug width. This measurement refers to the attachment width between the case lugs, which can be verified with a digital caliper on the interior of the lugs, at the spring bar position. The strap typically tapers to 18 mm at the buckle.

For the white gold case of the 13635E1, a smooth alligator strap in midnight blue, anthracite grey, or glossy black is the most appropriate choice for the watch's sartorial character. Polished box-calf leather is an excellent alternative for those who appreciate a strap that develops personal patina over time. Both options are available on milanostraps.it in the 20mm size.

The strap is removed using a dedicated lever tool or a flat-head screwdriver to slide the spring bars within the lugs. Given the slim profile of the white gold case, it is advisable to entrust the task to a watchmaker or specialized retailer to avoid scratches on the precious metal surface. Casati Milano offers this service by appointment at their Milan atelier.

Yes, aftermarket straps with 20 mm lugs and curved ends are compatible with the Master Ultra Thin 13635E1. It is essential to verify that the strap end follows the curvature of the case back to ensure a precise fit. On milanostraps.it you will find a selection of handcrafted 20mm straps compatible with this model, made with premium materials.

The lifespan of a leather strap depends on the material, frequency of use, and exposure to perspiration and humidity. A high-quality alligator strap, with regular but not daily use, maintains its aesthetic and structural qualities for 3-5 years. Box-calf leather develops patina over time but may have a slightly shorter useful life under intensive use conditions. Casati Milano guarantees their straps for 18 months against manufacturing defects.