Jaeger-LeCoultre
Master Ultra Thin Q1313581— lug 18mm

The Jaeger-LeCoultre Master Ultra Thin Q1313581 is fitted with a native 18 mm lug width. This measurement is specific to the reference and must be respected to ensure proper strap fit and preserve the visual proportions of the white gold case.

For a watch featuring a tourbillon and minute repeater in white gold, an alligator belly or hornback leather strap represents the most appropriate choice consistent with the haute horlogerie register of the piece. Box calf is a refined alternative for daily wear, while vulcanized rubber suits more contemporary contexts. All straps must be cut to 18 mm lug width.

The strap is removed using a springbar tool inserted between the lug and the spring bar. Given the delicacy of the white gold case and the presence of high-level complications, it is advisable to entrust the replacement to an experienced watchmaker or the Casati Milano atelier to avoid scratching the brushed surfaces.

Yes. Any strap with an 18 mm lug width and standard spring bars is technically compatible. Milano Straps offers a selection of artisanal 18 mm straps made from premium materials—alligator, calf, NATO, rubber—with finishes and stitching suited to the aesthetic level of a Jaeger-LeCoultre watch.

The lifespan of a leather strap depends on the quality of the leather, frequency of use, and exposure to moisture and perspiration. A high-quality alligator strap, used with care and rotated with other straps, can last 3 to 5 years while maintaining structural integrity and patina. Casati Milano straps are guaranteed for 18 months against manufacturing defects.