Strap for Master Ultra Thin Moon 36 Pink Gold - Diamond / Silver / Alligator

The lug width of the Jaeger-LeCoultre Master Ultra Thin 1242501 is 17 mm. This measurement is taken inside the case lugs, from outer edge to outer edge. It is essential to verify this dimension before ordering an aftermarket strap to ensure perfect fit and eliminate mechanical stress.

The best strap for this timepiece is vegetable-tanned alligator leather, which harmonises perfectly with the rose gold case and minimalist proportions. Vegetable-tanned calfskin represents an excellent alternative for softness and durability. Colour selection—cognac brown, black, or dark blue—depends on your intended context and desired patina development over time.

Strap replacement requires an appropriate spring bar tool. Position the watch with the case facing downward, insert the removal tool into the small opening of the lug to release the spring, then extract the old strap. Repeat for the opposite side, inserting the new strap carefully. If you are inexperienced, it is advisable to contact a professional service such as Casati Milano to avoid damage to the case.

Yes, it is possible to use aftermarket straps provided they respect the 17 mm lug width and aesthetic proportions of the case (36 mm diameter, ultra-thin profile). High-quality vegetable-tanned alligator or calfskin straps are the most suitable choices. Always verify that the strap is produced by reputable manufacturers to preserve the value and elegance of the watch.

The lifespan of a leather strap depends on frequency of use, environmental conditions, and quality of tanning. A professionally-made vegetable-tanned strap typically withstands 3 to 5 years of daily wear. Exposure to direct sunlight, humidity, and perspiration accelerates deterioration. With proper maintenance (regular cleaning, protective storage) and rotation with alternative straps, longevity can be extended significantly.