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

The Jaeger-LeCoultre Master Ultra Thin 1368470 features a 21mm lug width, which is the distance between the pins that connect the case to the lugs. This dimension is critical for aftermarket strap compatibility and should not be confused with other common widths (18mm, 20mm, 22mm). We recommend measuring directly on your watch using a calliper or consulting a professional watchmaker.

The Master Ultra Thin 1368470 pairs exceptionally well with alligator, shell cordovan, vegetable-tanned calf leather, and optionally NATO or FKM rubber. Your choice depends on intended use: for formal occasions, consider dark brown alligator or bordeaux cordovan; for elegant daily wear, cognac calf; for sporty versatility, navy NATO or black rubber with steel deployante. Each material enhances different facets of the watch's minimalist severity.

Strap replacement requires extraction of the spring bars (or quick-release links, if fitted) connecting the case to the lugs. Use a dedicated spring bar tool to compress the pin and release the old strap, then insert the new strap by aligning the lug holes with the case seats. We strongly recommend entrusting this operation to a professional if you lack experience, to prevent damage to the case finish.

Yes, provided the strap is specifically manufactured for 21mm lug width. High-quality aftermarket straps, crafted from full-grain or vegetable-tanned leather, maintain elevated standards of finish and durability. Verify that the lug width fits snugly to the case and that the lug holes show minimal play. Browse our certified 21mm strap collection for tested, compatible options.

Leather strap longevity depends on frequency of use, leather quality, and environmental conditions. A high-quality alligator or shell cordovan strap typically lasts 3–5 years with moderate daily wear; vegetable-tanned calf generally lasts 2–3 years; sporty materials such as NATO or FKM rubber can exceed 5 years. Natural patina and micro-creasing do not compromise functionality. Primary wear occurs at the pin contact point and the bend at the lug; timely strap replacement protects the case from moisture accumulation.