Jaeger-LeCoultre
Master Ultra Thin 1258420— lug 20mm

The lug width of the Jaeger-LeCoultre Master Ultra Thin ref. 1258420 is 20mm. This is the internal distance between the two lugs at the case attachment point, verifiable with a digital caliper or by measuring the spring bar of the original strap.

For a dress watch with complication like the Master Ultra Thin 1258420, a vegetable-tanned Mississippiensis alligator strap is the first choice: the natural grain enhances the refinement of the steel case. Smooth box-grain calf leather is the most formal alternative, while quality nylon NATO suits informal contexts. The strap thickness at the attachment point must be minimal to respect the timepiece's thin profile.

The Master Ultra Thin 1258420 strap is removed with a thin-bladed spring bar tool, inserted into the lateral groove of the lug to compress the spring bar. On such thin cases, it is advisable to use a tool with a blunt tip to avoid scratching the finishing. The operation is straightforward but requires care: work on a soft cloth and with adequate lighting.

Yes, all straps with 20mm lugs are compatible with the Jaeger-LeCoultre Master Ultra Thin 1258420. A selection of 20mm straps in various materials and colors, handcrafted, is available on milanostraps.it. For a bespoke strap with leather choice and custom stitching, Casati Milano offers an appointment-based service at their Milan atelier.

The lifespan of a leather strap depends on the material, usage, and care. A quality alligator strap, alternated with others and treated with nourishing cream every 2-3 months, lasts an average of 3-5 years while developing a distinguished patina. Box-grain calf tends to develop superficial micro-scratches over time that increase its character. Milano Straps straps are covered by an 18-month warranty against manufacturing defects.