Strap for Master Ultra Thin Moon Stainless Steel / Black / Alligator

The lug width of the Jaeger-LeCoultre Master Ultra Thin Q1368471 is 21 millimetres. This dimension is specific to this model and is determined by the proportion between the case diameter (39mm) and the ultra-thin thickness (7.58mm). Verify compatibility by measuring the base of the lug with callipers or by visual comparison with a known reference.

The best strap depends on usage and aesthetic preferences. For sartorial elegance, we recommend medium-brown alligator or vegetable-tanned calf leather. Shell cordovan offers density and intrinsic lustre, ideal for formal occasions. For daily wear, black calf with raw edges amplifies the geometric contrast with the polished steel case. Natural or synthetic rubber straps are ideal if the watch is used in widely varying climatic environments.

Strap replacement requires a dedicated tool (spring bar tool) to push the spring bars that secure the strap to the lugs. Insert the tool into the small hole beneath the lug, push the bar inward, and the strap releases. Proceed carefully to avoid scratching the steel case. If inexperienced, entrust the task to an authorised service centre or specialised craftsman such as Casati Milano.

Yes, it is possible to use aftermarket straps compatible with the 21mm lug width. The crucial point is to select a strap of equivalent quality that respects the proportions of the ultra-thin design. Straps in alligator, calf, shell cordovan, or quality rubber will preserve the aesthetic identity of the timepiece. We recommend consulting specialised manufacturers who understand the construction parameters of JLC sports and classic watches.

A quality artisanal leather strap, worn daily, typically lasts 2-4 years before requiring replacement. Longevity depends on the tanning method (vegetable or synthetic), thickness, frequency of use, and exposure to moisture and sunlight. Vegetable-tanned straps develop patina but may deteriorate more rapidly if exposed to extreme climatic variation. Casati Milano guarantees 18 months against manufacturing defects and can restore worn straps through leather regeneration.