Jaeger-LeCoultre
Master Ultra Thin 1252501— lug 20mm

The Jaeger-LeCoultre Master Ultra Thin 1252501 is fitted with a 20mm lug width. This measurement is taken internally between the two horns of the case and is the fundamental parameter for choosing a compatible strap. The width can be tapered towards the buckle (typically 16-18mm) for a more slender aesthetic effect.

For the Master Ultra Thin 1252501 in rose gold, the polished alligator strap — in cognac, burgundy or midnight blue tones — is the most coherent choice with the haute horlogerie identity of the 925/1 caliber. Box calf leather represents a more everyday alternative but equally refined. Both pair perfectly with the warm color of the case and the moonphase on the dial.

Strap replacement on the Master Ultra Thin 1252501 is carried out via spring bars positioned between the case lugs. A special lever tool or spring bar screwdriver is required to remove them without scratching the rose gold. It is recommended to entrust the task to a watchmaker or the Casati Milano atelier to preserve the integrity of the precious metal lugs.

Yes, all straps with 20mm attachment width are technically compatible with the Master Ultra Thin 1252501. Milano Straps offers a selection of artisanal 20mm straps — in alligator, calf, NATO and other materials — crafted with stitching and finishes suited to the quality level of a Jaeger-LeCoultre timepiece. Casati Milano's custom production also allows you to personalize color, texture, buckle and tapering.

The lifespan of a leather strap depends on the material, care and daily use. A quality alligator strap, treated correctly and kept away from excessive sweat and water, can last 3 to 5 years while maintaining good structural integrity. Calf leather tends to develop a characteristic patina over time, but wears faster than alligator. Casati Milano straps are covered by an 18-month warranty against manufacturing defects.